一种新型高强韧弹簧钢的脱碳敏感性  

Decarburization sensitivity of a new kind of high strength and toughness spring steel

作　　者：姜政宇 郑健 赵阳 陈礼清[1] Jiang Zhengyu;Zheng Jian;Zhao Yang;Chen Liqing(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;Xiangtan Iron&Steel Group Co.,Ltd.,Xiangtan 411101,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,沈阳110819 [2]湘潭钢铁集团有限公司,湖南湘潭411101 [3]东北大学材料科学与工程学院,沈阳110819

出　　处：《材料与冶金学报》2024年第5期484-490,共7页Journal of Materials and Metallurgy

基　　金：国家自然科学基金面上项目(52174359)。

摘　　要：以一种新研发的Si-Cr系高强韧弹簧钢为实验材料,对不同加热和保温条件下该弹簧钢表面脱碳层形貌特征、脱碳敏感性及其影响机理等进行了研究,并从理论上建立了弹簧钢脱碳层深度与保温条件的关系.结果表明:该弹簧钢的总脱碳层深度随加热温度的升高呈先增加后减小的趋势,当加热温度为1100℃时,总脱碳层深度达到最大,约为231.2μm,其脱碳敏感温度为(1100±50)℃;随着保温时间的延长,弹簧钢脱碳层深度增加,且脱碳层深度与保温时间的平方根存在线性关系.与其他Si-Mn系和Si-Cr系弹簧钢相比,该Si-Cr系弹簧钢中由于碳含量较低,硅含量也适当降低,并且添加了适量的Cr和V,有效降低了脱碳敏感性.The decarburization layer morphology,decarburization sensitivity,and the underlying mechanisms of a newly developed Si-Cr high strength and high toughness spring steel were investigated under different heating and holding conditions.A theoretical model was established to describe the relationship between decarburization layer depth and holding conditions.The results show that the total decarburization layer depth of the spring steel first increases and then decreases with the increase of heating temperature.The maximum decarburization layer depth is about 231.2μm at heating temperature of 1100℃,with a decarburization sensitivity temperature range of(1100±50)℃.As the holding time increases,the depth of the decarburization layer increases,and the depth of the decarburization layer has a linear relationship with the square root of the holding time.Compared with other Si-Mn and Si-Cr spring steels,this Si-Cr spring steel exhibits reduced decarburization sensitivity due to its lower carbon content,appropriately silicon content,and the addition of suitable amounts of Cr and V.

关 键 词：弹簧钢 脱碳敏感性 微观组织 加热温度 保温时间 

分 类 号：TG141[一般工业技术—材料科学与工程]