大规格高碳钢盘条SWRH82B中的内部缺陷及形成原因  

Internal defects and reasons of large-size high carbon steel wire rod SWRH82B

作　　者：赵捷[1] 包俊成[1] 朱树行 王志奇[1] 宁宝群[1] 阎振 

机构地区：[1]天津理工大学材料科学与工程学院,天津300384 [2]天津市预应力钢丝有限公司,天津300400

出　　处：《金属热处理》2011年第4期50-54,共5页Heat Treatment of Metals

基　　金：东北大学轧制技术及连轧自动化国家重点实验室开放课题基金(2007-3);天津市高等学校科技发展基金计划项目(20080310)

摘　　要：利用OM、EDS、SEM和XRD等手段,对大规格高碳钢盘条SWRH82B的组织,断口形貌,夹杂物成分、大小与分布,残余应力等进行研究,分析了盘条内部缺陷的形成原因和对盘条力学性能的影响。结果发现,82B盘条中存在C、Cr元素偏析和组织不均匀现象;出现"黑心+白点"特征断口和平齐断口;盘条中的夹杂物分布不均且有尺寸100～200μm的复合脆性夹杂物,热轧后盘条中存在较大的宏观与微观应力。The microstructure, fracture morphology, composition and distribution of inclusions, residual stress of large-size high carbon steel wire rod SWRH82B were investigated by means of OM, SEM, EDS and XRD. The forming reasons of internal defects and effect on mechanical properties of 82B wire rod were analyzed. The results show that heavy segregation of C, Cr elements and inhomogeneous microstructure are found in 82B wire rod. The black core with white point fracture and plane shape fracture appear. There are composite brittle inclusions （ 100- 200μm）and greater residual stress in wire rod after hot rolling,and distribution of the inclusions is also uneven.

关 键 词：高碳钢盘条 偏析 脆性夹杂物 残余应力 表面缺陷 

分 类 号：TF761.4[冶金工程—钢铁冶金] TG356.21[金属学及工艺—金属压力加工]