Analysis on Surface Crack Formation Mechanism for Crankshaft Forgings of Steel 42CrMo and Process Improvement

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Analysis on Surface Crack Formation Mechanism for Crankshaft Forgings of Steel 42CrMo and Process Improvement

更新时间：2026-01-21

- Analysis on Surface Crack Formation Mechanism for Crankshaft Forgings of Steel 42CrMo and Process Improvement
- Special Steel Vol. 35, Issue 3, Pages: 59-61(2014)
- 作者机构：
  
  四川建筑职业技术学院机电工程系,德阳,618000
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：20 December 2013，
  
  Online First：02 September 2022，
  
  Published：02 September 2014
- 稿件说明：
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王长健. Analysis on Surface Crack Formation Mechanism for Crankshaft Forgings of Steel 42CrMo and Process Improvement[J]. Special Steel, 2014, 35(3): 59-61.
DOI：

王长健. Analysis on Surface Crack Formation Mechanism for Crankshaft Forgings of Steel 42CrMo and Process Improvement[J]. Special Steel, 2014, 35(3): 59-61. DOI：

摘要

对865℃1.5 h油淬+640℃4 h回火、水冷的42CrMo钢(/%:0.43C

0.77Mn

0.24Si

0.014P

0.007S

1.08Cr

0.17Mo

0.01Cu)曲轴锻件表面裂纹形成进行了分析。结果表明

曲轴锻件表面裂纹为淬火裂纹

回火时间不足(4 h)和锻件存在较严重的带状组织(3级)是该曲轴产生淬火裂纹的主要原因。通过将回火时间延长至5 h

控制带状组织≤2级

曲轴调质后未发现裂纹

产品合格率达100%。

Abstract

An analysis on the surface crack formation for crankshaft forgings of steel 42CrMo (/%: 0. 43C

0. 77Mn

0. 24Si

0. 014P

0. 007S

1. 08Cr

0.17Mo

0. 01Cu) with 865 ℃ 1. 5 h oil quenching + 640 ℃ 4 h tempering

water cooling has been carried out. Results show that the surface cracks of crankshaft forgings are quenching cracks

and the main causes for quenching cracks of crankshaft are insufficient tempering holding time (4 h) and more serious banded orientation structure exiting in forgings (rating 3). With prolonging the tempering time to 5 h and controlling the banded orientation structure in forgings ≤ rating 2

the cracks are not found in quenched and tempered crankshaft forgings and the qualified products are up to 100%.

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