ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2014, Vol. 35 ›› Issue (3): 59-61.

• 组织和性能 • 上一篇    下一篇

42CrMo钢曲轴锻件表面裂纹形成机理分析和工艺改进

王长健   

  1. 四川建筑职业技术学院机电工程系,德阳618000
  • 收稿日期:2013-12-20 出版日期:2014-06-01 发布日期:2022-09-02
  • 作者简介:王长健(1978-),男,硕士,高级工程师,2000年四川工业学院(本科)毕业,冶金产品失效分析和热处理工艺研究。

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

Wang Changjian   

  1. Steel 42CrMo, Crankshaft Forgings, Quenching and Tempering, Banded Orientation Structure, Crack, Process Improvement
  • Received:2013-12-20 Published:2014-06-01 Online:2022-09-02

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%。

关键词: 42CrMo钢, 曲轴, 调质, 带状组织, 裂纹, 工艺改进

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%.