低碳中锰无缝钢管组织转变规律研究  

Study on Law of Microstructure Transformation for Low Carbon Medium Manganese Seamless Steel Tube

作　　者：魏淼[1] 米永峰[1] 石晓霞[1] 姜海龙[1] 张行刚[1] 许博超 Wei Miao;Mi Yong-feng;Shi Xiao-xia;Jiang Hai-long;Zhang Xing-gang;Xu Bo-chao(Steel Tube Co.of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China)

机构地区：[1]内蒙古包钢钢联股份有限公司钢管公司,内蒙古包头014010

出　　处：《包钢科技》2021年第3期62-64,68,共4页Science & Technology of Baotou Steel

摘　　要：文章以低碳中锰钢为研究对象,利用FORMASTOR-F全自动相变仪,测定了试验钢连续冷却转变的CCT曲线。结果表明:冷却速度为0.1~0.5℃/s时,室温组织为先共析铁素体+珠光体;冷却速度为1~2℃/s时,出现粒状贝氏体,室温组织为铁素体+珠光体+粒状贝氏体;当冷速为5~10℃/s时,贝氏体逐渐向马氏体转变,马氏体不断增加,室温下为马氏体+贝氏体混合组织;当冷速大于10.0℃/s,室温下为马氏体组织。为热处理工艺的制定提供了参考依据。In this paper,the continuous cooling transformation(CCT)curve of test steel is determined with FORMASTOR-F full automatic phase transformation instrument by taking low carbon medium manganese steel as the object of study.The results showed that the microstructure at room temperature was proeutectoid ferrite+pearlite when the cooling rate was 0.1~0.5℃/s;when the cooling rate was 1~2℃/s,there was granular bainite and the microstructure at room temperature was ferrite+pearlite+granular bainite;when the cooling rate was 5~10℃/s,the bainite gradually transformed to martensite,so the martensite increased continuously and it was the mixed microstructure of martensite+bainite at room temperature;when the cooling rate was greater than 10.0℃/s,it was martensite structure at room temperature,which provide references for formulating heat treatment process.

关 键 词：低碳中锰钢 无缝管 连续冷却 CCT曲线 组织转变 

分 类 号：TG142.1[一般工业技术—材料科学与工程]