锻压技术

36MnVS4非调质钢胀断连杆的胀断缺陷分析

英文标题：Analysis on expansion fracture defects for 36MnVS4 non-tempered steel expansion fracture connecting rod

单位：（1.江苏永钢集团有限公司江苏张家港 215628 2.北京科技大学碳中和研究院北京 100083 3.张家港环鑫精密锻造有限公司江苏张家港 215621）

分类号：TG142.1

出版年,卷(期):页码：2024,49(9):239-245

摘要：

对36MnVS4非调质钢胀断连杆的断口不齐及掉渣胀断缺陷进行了分析。通过显微组织定量分析、断口形貌观察和力学性能测试，并与VW50030标准和T/CCMI 13.1—2021标准进行比较，结果表明：36MnVS4胀断连杆的显微组织为铁素体+珠光体，但缺陷连杆掉渣侧的铁素体含量为37.0%~39.8%，不符合标准要求。缺陷连杆的断面收缩率为51.0%~51.5%，超过30%~50%的标准要求。同时，在掉渣区域存在明显的韧性断裂区域，证明胀断过程存在塑形变形。因此，组织上铁素体含量超标，断面收缩率较大，导致胀断连杆的胀断性能较差，是产生胀断缺陷的主要原因。

The expansion fracture defects of uneven fracture and drop-dregs for 36MnVS4 non-tempered steel expansion fracture connecting rods were analyzed. Then, the quantitative analysis of microstructure, the observation of fracture morphology and the mechanical property test were conducted, and the standards of VW 50030 and T/CCMI 13.1—2021 were compared. The results show that the microstructure of 36MnVS4 expansion fracture connecting rod is ferrite and pearlite, but the ferrite content on drop-dregs side of the defective connecting rods is 37.0%-39.8%, which does not meet the standard requirements. The percentage reduction of area of the defective connecting rod is 51.0%-51.5%, which exceeds the standard requirement of 30%-50%. At the same time, there are obvious ductile fracture areas in the drop-dregs area, which proves that there is plastic deformation in the expansion fracture process. Thus, the excessive ferrite content in the organization and the large percentage reduction of area result in the poor expansion fracture performance of expansion fracture connecting rod, which is the main reason for the occurrence of expansion fracture defects.

基金项目：

基金项目:张家港市科技计划项目（202303）

作者简介：屈小波（1983-），男，本科，高级工程师 E-mail：qubo6101@163.com 通信作者：张朝磊（1984-），男，博士，副教授 E-mail：zhangchaolei@ustb.edu.cn

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