Cr、Nb复合对高碳钢连续冷却时组织转变的影响  

Effects of combined Cr and Nb on phase transformation of high carbon steel during continuous cooling

作　　者：王凯[1] 杨忠民[1] 陈颖[1] 王慧敏[1] Wang Kai;Yang Zhongmin;Chen Ying;Wang I-Iuimin(Institute of Engineering Steel,China Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]钢铁研究总院工程用钢所

出　　处：《金属热处理》2018年第8期17-22,共6页Heat Treatment of Metals

摘　　要：针对82B盘条钢实际生产中常出现的组织不均以及心部异常组织等问题,设计了一种Cr、Nb复合作用的高碳盘条钢,用Formastor全自动相变仪模拟连续加热和冷却试验,研究了连续冷却条件下调整Cr、Nb（0.51Cr-0.027Nb）含量与原合金含量对高碳钢组织转变的影响。结果表明：随着Cr含量的提高以及Nb的加入,试验钢强韧性提高,对比试验钢的CCT曲线可以发现,Cr、Nb的复合化作用可以使高碳钢CCT曲线在较低冷速下实现＂扁平化＂,扩大工艺区间,解决实际生产中高碳钢线材的组织不均匀以及异常组织问题。A kind of alloy system of Cr and Nb microalloyed steel was designed in order to find a solution of non-uniform microstructure and abnormal core microstructure in the actual production of 82 B wire rod steel. The continuous heating and cooling experiments were simulated by using Formaster automatic phase change instrument. The effect of Cr,Nb（ 0. 51 Cr-0. 027 Nb） content and the content of original alloy on microstructure transformation of the high carbon steel were studied under continuous cooling. The test results show that with the increase of Cr content and the addition of Nb,the strength and toughness of the test steel are increased. Compared with the CCT curves of the test steel,it is found that the Cr-Nb microalloying can make the CCT curves of high carbon steel ＂flattening＂,and expand the process range at lower cooling rate,and solve non-uniform microstructure and abnormal microstructure of the high carbon steel wire in actual production.

关 键 词：CR NB 高碳钢 CCT曲线 

分 类 号：TG151.2[金属学及工艺—热处理]