normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; LINE-HEIGHT: 22pt">4．连杆热处理工艺改进后效果
normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; LINE-HEIGHT: 22pt">通过对该连杆热处理工艺的改进，热处理返工率大大降低。改进后，已完成连杆锻件共16炉次，300余件经热处理，热处理质量稳定。其性能数据见表4、表5。
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>表4 经正火喷雾风冷+高温回火后性能数据
normal style="MARGIN: 0cm 0cm 0pt" align=left>
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>编号
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>含碳量(质量分数，％)
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>抗拉强度/MPa
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>屈服强度/MPa
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>伸长率(％)
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>断面收缩率(％)
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>冲击功Aku5/J
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>硬度HBS
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-118-1
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.46
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>640
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>365
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>25
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>48
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>23
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>169
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-118-2
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.46
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>615
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>355
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>25
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>48
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>26
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>169
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-115-1
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.46
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>640
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>370
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>24
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>49
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>24
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>167
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-115-2
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.46
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>650
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>380
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>22
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>43
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>24
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>171
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-123-1
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.48
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>605
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>355
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>26
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>47
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>25
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>167
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-119-1
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.47
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>665
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>385
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>26
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>50
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>25
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>174
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-119-2
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.47
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>640
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>365
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>26
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>50
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>24
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>166
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-124-1
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.48
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>615
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>360
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>23
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>50
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>23
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>166
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-124-2
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.48
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>610
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>355
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>25
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>46
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>25
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>166
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>表5 经调质处理后性能数据
normal style="MARGIN: 0cm 0cm 0pt" align=left>
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>编号
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>含碳量(质量分数，％)
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>抗拉强度/MPa
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>屈服强度/MPa
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>伸长率(％)
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>断面收缩率(％)
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>冲击功Aku5/J
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>硬度HBS
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-121-1
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.44
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>660
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>385
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>27
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>57
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>34
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>192
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-121-2
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.44
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>660
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>395
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>27
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>55
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>33
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>190
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-117-1
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.44
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>695
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>410
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>26
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>61
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>33
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>195
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-117-2
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.44
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>685
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>410
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>28
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>60
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>30
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>198
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-116-1
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.43
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>665
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>400
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>24
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>58
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>31
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>192
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-116-2
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.43
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>680
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>400
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>24
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>58
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>31
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>196
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-116-3
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>0.43
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>680
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>390
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>26
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>58
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>31
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>195
normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; LINE-HEIGHT: 22pt">为了进一步验证热处理工艺，我们抽取正火+高温回火处理(编号4-123-1、4-118-2、4-124-2)和调质处理(编号4-116-1)冲击试样进行金相分析。分析结果见表6。金相组织分别如图3～6所示。
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>表6 连杆金相组织及晶粒度
normal style="MARGIN: 0cm 0cm 0pt" align=left>
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>编号
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>金相组织
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>晶粒度(级)
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>金相组织
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-123-1
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>珠光体+铁素体
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>8
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>图3
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-118-2
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>珠光体+铁素体
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>8
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>图4
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-124-2
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>珠光体+铁索体
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>7.5
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>图5
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>4-116-1
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>珠光体+铁素体
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>6
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 24pt; TEXT-ALIGN: center" align=center>图6
图3 4-123-1 金相组织
图4 4-118-2 金相组织
图5 4-124-2 金相组织
normal style="MARGIN: 0cm 0cm 0pt" align=center>图6 4-116-1 金相组织
normal style="MARGIN: 0cm 0cm 0pt" align=left>
normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 26.25pt; LINE-HEIGHT: 22pt">5．结语
normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 26.25pt; LINE-HEIGHT: 22pt">(1)通过对大型45钢连杆热处理工艺改进，热处理返工率大大降低，提高了连杆锻件船检的一次合格率，同时有效地保证了连杆热处理质量和综合力学性能。
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 22pt"> (2)该连杆热处理工艺的改进，对于综合性能要求较高的大型45钢产品的热处理生产，具有较高的推广价值。
