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Mechanical properties and microstructural evaluation of the heat-affected zone in ultra-high strength steels
Thin-Walled Structures ( IF 6.4 ) Pub Date : 2020-09-17 , DOI: 10.1016/j.tws.2020.107072
Mohsen Amraei , Shahriar Afkhami , Vahid Javaheri , Jari Larkiola , Tuomas Skriko , Timo Björk , Xiao-Ling Zhao

This paper presents an investigation into the mechanical properties of ultra-high strength steels (UHSSs) (with nominal yield stress of 960 and 1100 MPa) after welding. Seven weld thermal cycles were simulated using a Gleeble 3800 thermal-mechanical machine. These cycles represented the temperature-time history of the joint at various distances from the weld fusion line (FL) in a typical gas metal arc welding (GMAW) process. The mechanical properties such as Vickers surface hardness, uniaxial tensile behavior and Charpy impact toughness were examined. Microstructural evaluation using field emission scanning electron microscopy (FESEM) was also conducted. According to the results, the S960 which was a direct-quenched type of steel, showed a considerable reduction in its hardness and tensile strength up to 29 and 32%, respectively. On the other hand, the S1100 which was manufactured via quenched and tempered process, showed only a minor degree of softening at far distances from the weld FL (up to 4%) followed by 2% tensile strength reduction, and hardening close to the FL (up to 13%). Microstructure analysis has been carried out to provide insight to the change of mechanical properties in UHSS after welding.



中文翻译:

超高强度钢热影响区的力学性能和显微组织评估

本文对焊接后的超高强度钢(UHSSs)(标称屈服应力为960和1100 MPa)的力学性能进行了研究。使用Gleeble 3800热力机械模拟了七个焊接热循环。在典型的气体保护金属电弧焊(GMAW)工艺中,这些循环代表了距焊接熔合线(FL)不同距离处的接头温度-时间历史。检验了机械性能,例如维氏表面硬度,单轴拉伸行为和夏比冲击韧性。还进行了使用场发射扫描电子显微镜(FESEM)的微观结构评估。根据结果​​,S960是直接淬火型钢,其硬度和抗拉强度分别降低了29%和32%。另一方面,通过淬火和回火工艺制造的S1100在距焊缝FL很远的地方仅表现出较小的软化程度(最高4%),其后的抗拉强度降低2%,而在FL附近的硬化程度(最高13%) )。进行了微结构分析,以提供对焊接后UHSS中机械性能变化的了解。

更新日期:2020-09-18
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