锻压技术

590 MPa级冷轧相变诱导塑性钢疲劳特性和断口分析

英文标题：Fatigue characteristics and fracture analysis of 590 MPa grade cold rolled phase transformation induced plastic steel

作者：杨晨李伟

单位：郑州科技学院机械工程学院河南郑州450064

关键词：相变诱导塑性钢双相钢疲劳特性极限应力断口形貌裂纹

分类号：TG142.12

出版年,卷(期):页码：2025,50(5):253-258

摘要：

针对相变诱导塑性钢HC380/590TR开展了疲劳特性研究。对比分析了同级别相变诱导塑性钢HC380/590TR和传统双相钢HC340/590DP的显微组织和力学性能，开展了拉-压疲劳寿命测试，获取了应力比为0.1时的疲劳寿命曲线和对应的应力极限，并基于试验测试和Gerber公式，获取了应力比为-1时的疲劳寿命曲线和对应的应力极限。对疲劳试样的表面形貌和断口形貌进行观察，并对裂纹源进行分析。结果表明：HC380/590TR钢的基体组织为铁素体、贝氏体和马氏体，并含有一定量的残余奥氏体；与同强度级别的HC340/590DP钢对比，HC380/590TR钢的屈强比提高了约22.98%，断后伸长率提升了49.04%，加工硬化指数提升了36.67%；HC380/590TR钢的疲劳比约为0.4，略高于同级别的HC340/590DP钢；HC380/590TR钢的疲劳裂纹主要萌生在试样表面，裂纹的萌生和扩展相对困难，其疲劳寿命略高于HC340/590DP钢。

A study on fatigue characteristics was conducted for the transformation induced plasticity steel HC380/590 TR. Then, the microstructure and mechanical properties of the transformation induced plasticity steel HC380/590TR and the traditional dual-phase steel HC340/590DP at the same strength grade were comparatively analyzed, and the tension-compression fatigue life test was carried out to obtain the fatigue life curve and the corresponding stress limit at the stress ratio of 0.1. Furthermore, based on the experimental test and Gerber formula, the fatigue life curve and the corresponding stress limit at the stress ratio of -1 were obtained, and the surface morphology and fracture morphology of the fatigue specimens were observed to analyze the crack source. The results show that the matrix structure of HC380/590TR steel consists of ferrite, bainite and martensite, and contains a certain amount of retained austenite. Compared with HC340/590DP steel at the same strength grade, the yield ratio of HC380/590TR steel increases by about 22.98%, the elongation after fracture increases by 49.04 %, and the work hardening index increases by 36.67%. And the fatigue ratio of HC380/590TR steel is about 0.4, which is slightly higher than that of HC340/590DP steel at the same strength grade. The fatigue cracks of HC380/590TR steel mainly initiate at the surface of specimen, and the initiation and propagation of cracks are relatively difficult, thus, its fatigue life is slightly higher than that of HC340/590DP steel.

基金项目：

河南省高等学校重点科研项目(21B460020)；河南省高等学校重点科研项目（23B460010）；河南省本科高校青年骨干教师培养计划资助项目（2023GGJS186）

作者简介：杨晨（1983-），女，硕士，副教授，E-mail：lxhcygy78@yeah.net

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