SWRH82B高碳热轧盘条性能时效规律与原因分析  

Regularity and Reason of Property Aging for SWRH82B High Carbon Hot-Rolling Wire Rod

作　　者：赵捷[1,2] 朱树行 王志奇[1,4] 阎振 宁保群[1] 包俊成[1] 

机构地区：[1]天津理工大学材料科学与工程学院,天津300384 [2]显示材料与光电器件省部共建教育部重点实验室,天津300384 [3]天津市预应力钢丝有限公司,天津300400 [4]天津市光电显示材料与器件重点实验室,天津300384

出　　处：《钢铁》2011年第12期53-58,共6页Iron and Steel

基　　金：天津市高等学校科技发展基金计划资助项目(20080310)

摘　　要：对大规格SWRH82B高碳钢盘条自然时效后的力学性能变化规律进行了较为系统的研究;借助OM、SEM、EDS和XRD等对其显微组织、夹杂物成分与分布、宏观与微观断口形貌、物相结构和残余应力等进行测试与分析。结果表明,82B盘条的断面收缩率随时效时间延长明显升高。满足盘条力学性能所需的时效时间与初始性能和环境温度有关;盘条中的夹杂物分布不均,且存在尺寸较大的复合脆性夹杂物,导致出现"黑心+白点"特征的断口形貌;时效后残余应力的释放和晶格畸变的减小是引起盘条断面收缩率提高的主要原因。The mechanical properties of large-size 82B high carbon steel wire rod were systemically investigated after natural aging.The microstructure,composition and distribution of inclusions,macro-and micro-fracture morphology,phase structure and residual stress of 82B wire rod were measured and analyzed by means of OM,SEM,EDS and XRD.The results show that area reduction ratio of 82B wire rod increases significantly with the aging time.Aging time required to meet the mechanical properties of 82B wire rod is related to its primary properties and environmental temperature.The distribution of the inclusions is not uniform in 82B wire rod.The fracture morphology of ＂black core ＋ white point＂ were found because of existence of larger-size composite brittle inclusions.The release of residual stresses and decrease of lattice distortion are the main reasons for causing the area reduction ratio to improve.

关 键 词：82B 盘条 自然时效 组织 性能 夹杂物 残余应力 

分 类 号：TG335.1[金属学及工艺—金属压力加工]