MnS夹杂形态对冷轧退火Ti微合金钢延伸率的影响  

Effect of MnS inclusion morphology on elongation of Ti-microalloyed steel after cold rolling and continuous annealing processing

作　　者：黄伟丽 李红斌 王杏娟 陈连生 田亚强 牛跃威 陈四平 Huang Weili;Li Hongbin;Wang Xingjuan;Chen Liansheng;Tian Yaqiang;Niu Yuewei;Chen Siping(Technology Center,Delong Steel Co.,Ltd.,Xingtai Hebei 054009,China;Hebei Hot Rolled Strip Technology Innovation Center,Xingtai Hebei 054009,China;Key Laboratory of the Ministry of Education for Modern Metallurgy Technology,North China University of Science and Technology,Tangshan Hebei 063210,China)

机构地区：[1]德龙钢铁有限公司技术中心,河北邢台054009 [2]河北省热轧板带钢技术创新中心,河北邢台054009 [3]华北理工大学教育部现代冶金技术重点实验室,河北北唐山063210

出　　处：《金属热处理》2023年第7期73-78,共6页Heat Treatment of Metals

基　　金：河北省科技厅重点研发计划(20311004D);河北省自然科学基金高端钢铁冶金联合基金(E2020209124,E2020209127,E2020209040);河北省自然科学基金重点项目(E2022209049)。

摘　　要：以Ti微合金钢为研究对象,采用OM、SEM等手段分析MnS夹杂在冷轧过程中的演变行为,随后对不同变形量的试样进行退火处理,并测试其拉伸性能和硬度,分析MnS夹杂形态对断裂行为的影响。结果表明,MnS夹杂物随着冷轧变形量的增加,最大长度增加的同时,MnS夹杂形态由带状转变为断续的短线状或粒状;随着冷轧压下量的增加,试样的延伸率逐步恶化,其主要原因为粒状的MnS夹杂增加了加载方向的界面面积,促进了界面裂纹的萌生。Taking Ti-microalloyed steel as the research object,the evolution behavior of MnS inclusions during the cold rolling process was analyzed by using OM,SEM,etc.Subsequently,the specimens with different deformation amounts were annealed,and their tensile properties and hardness were tested to analyze the influence of MnS inclusion morphology on fracture behavior.The results show that with the increase of cold rolling deformation,the maximum length of MnS inclusions increases,and at the same time,the morphology of MnS inclusions changes from banded to intermittent short linear or granular.With the increase of cold rolling reduction,the elongation of the specimen gradually deteriorates,mainly due to the increase in the interface area of the loading direction caused by granular MnS inclusions,which promotes the initiation of interface cracks.

关 键 词：MnS夹杂 TI微合金钢 冷轧退火 延伸率 断口形貌 

分 类 号：TG146[一般工业技术—材料科学与工程]