摘要
高强度与高韧性汽车用弹簧钢的开发与使用已成为减轻重型载货汽车整备质量的主要手段,采用先进的热处理工艺对提升弹簧钢的强度与韧性具有重要意义。以新开发的1800 MPa级52CrMn钢为对象,以加热温度、回火温度、回火保温时间为设计因子,以热处理后材料的抗拉强度和断后伸长率为响应指标,基于响应曲面法设计了多组不同工艺参数下的弹簧钢热处理试验,获得了该52CrMn钢的最佳淬回火热处理工艺制度。进一步通过金相组织观察阐释了该材料性能随着各工艺参数的变化规律。结果表明:建立的响应面模型能够准确表征该52CrMn钢在不同热处理工艺参数下的强韧性。该钢种的最佳热处理工艺为加热温度880~900℃、回火温度370~380℃、回火保温时间30~50 min,该工艺下可获得高于1800 MPa的抗拉强度且断后伸长率为8.61%,可保证热处理后该弹簧钢具有较高的强度和足够的韧性。
The development and use of high-strength and high-toughness automotive spring steel has become the main means to reduce the mass of heavy duty trucks,and it is important to adopt advance heat treatment process to improve the strength and toughness of spring steel.Taking a newly developed 1800 MPa class 52CrMn steel as the object,with the heating temperature,tempering temperature and tempering holding time as the design factors,the tensile strength and fracture elongation after heat treatment as the response index,several groups of heat treatment experiments of spring steel under different process parameters on the basis of the response surface method were designed.The optimum combination of quenching and tempering heat treatment of 52CrMn steel was obtained,and the law of the material properties variation with each process parameter was also explained by metallographic observation.The results show that the strength and toughness of 52CrMn steel under different heat treatment process parameters can be accurately predicted by the established response surface model.The optimal heat treatment process of the steel is the heating temperature of 880-900℃,the tempering temperature of 370-380℃,and the tempering holding time of 30-50 min.The tensile strength of the steel is higher than 1800 MPa and the fracture elongation is 8.61%,which can ensure that the spring steel owns high strength and sufficient toughness after heat treatment.
作者
张雅军
盈亮
任鹏
侯世耀
杨姝
亓昌
ZHANG Yajun;YING Liang;REN Peng;HOU Shiyao;YANG Shu;QI Chang(School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China;Engineering Research Institute,Beiqi Foton Automobile Co.,Ltd.,Beijing 102206,China;Qingdao Special Iron and Steel Co.,Ltd.,Qingdao 266409,China;Ningbo Research Institute of Dalian University of Technology,Ningbo 315016,China)
出处
《热加工工艺》
北大核心
2025年第13期17-23,共7页
Hot Working Technology
基金
国家重点研发项目(2022YFB2503503)
国家自然科学基金资助项目(52375310)。
关键词
弹簧钢
响应面法
热处理工艺
力学性能
spring steel
response surface method
heat treatment process
mechanical properties
