中碳微合金非调质钢46MnVS5连杆胀断缺陷分析  

Analysis on Splitting Failure of Medium Carbon Microalloyed Non-quenched and Tempered Steel 46MnVS5 Connecting Rod

作　　者：刘运娜[1] 董帅君 郝彦英[1] 刘献达 张朝磊[2] LIU Yunna;DONG Shuaijun;HAO Yanying;LIU Xianda;ZHANG Chaolei(HBIS Group Shijiazhuang Iron and Steel Co.,Ltd.,Shijiazhuang 050031,China;Innovation Research Institute for Carbon Neutrality,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]河钢集团石家庄钢铁有限责任公司,河北石家庄050031 [2]北京科技大学碳中和创新研究院,北京100083

出　　处：《热加工工艺》2025年第5期139-142,146,共5页Hot Working Technology

基　　金：河北省重大科技成果转化专项项目(22281004Z);河钢集团重点科技项目计划项目(HG2022114)。

摘　　要：通过对合金成分、显微组织定量分析以及断口观察和力学性能测定,对中碳微合金非调质钢46MnVS5连杆胀断后变形大、断口不齐两种缺陷进行分析。结果表明:两支连杆抗拉强度达到1120.8~1140.2 MPa,接近标准上限;1^(#)连杆断面收缩率超过标准要求,达到47.2%~47.7%;2^(#)连杆塑性符合标准,断面收缩率接近标准上限,达到43.2%~44.7%,二者的强塑积达到18052.9~19743.9 MPa·%。性能上断面收缩率超过标准,强塑积过高是产生胀断缺陷的主要原因,提出采用控锻控冷技术精确控制组织和性能是解决这些缺陷的关键。该研究为提升连杆质量提供了理论支持。Through quantitative analysis of alloy composition,microstructure,fracture observation and measurement of mechanical properties,the large deformation and uneven fracture after fracture defects of the medium carbon microalloyed non-quenched and tempered steel 46MnVS5 connecting rods were analyzed.The results show that the tensile strength of the two connecting rods reaches 1120.8 MPa-1140.2 MPa,which is close to the upper limit of the standard;the area reduction of 1^(#)connecting rod exceeds the standard requirement,which is 47.2%-47.7%.The plasticity of 2^(#)connecting rod meets the standard,and the area reduction is close to the upper limit of the standard,reaching 43.2%-44.7%.The strong plastic volume reaches 18052.9-19743.9 MPa·%.In terms of the performance,the reduction of area exceeds the standard,and the strong plastic product is too high,which is the main reason for the fracture defects.It is proposed that using thermomechanical control process(TMCP)to precisely control the microstructure and properties,which is the key to solve the defects.It provides theoretical support for improving the quality of connecting rods.

关 键 词：非调质钢 胀断加工 控锻控冷 

分 类 号：TG142.1[一般工业技术—材料科学与工程]