BTP500钢板过冷奥氏体连续冷却转变行为  

Continuous cooling transformation behavior of undercooled austenite in BTP500 steel plate

作　　者：董丽丽 崔成波 袁晓鸣[1] 刘泽田 Dong Lili;Cui Chengbo;Yuan Xiaoming;Liu Zetian(Technology Center,Inner Mongolia Baogang Steel Union Co.,Ltd.,Baotou Inner Mongolia 014010,China;School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]内蒙古包钢钢联股份有限公司技术中心,内蒙古包头014010 [2]河北工业大学材料科学与工程学院,天津300130

出　　处：《金属热处理》2024年第7期157-160,共4页Heat Treatment of Metals

摘　　要：对高性能稀土微合金化BTP500钢板奥氏体连续冷却相变行为进行研究,明确所设计的BTP500钢板在不同冷却速率下获得的相种类和获得马氏体组织的具体条件,再根据结果进行小规模工业化试制。结果表明:不同冷速下稀土微合金化BTP500钢板在连续冷却过程中分别发生了铁素体+珠光体的转变(A→F+P)、贝氏体转变(A→B)和马氏体转变(A→M)。由CCT曲线确定BTP500钢板得到完全马氏体的临界冷速为7℃/s。采用780℃淬火+210℃回火工艺小规模工业化试制生产的BTP500钢板显微组织为马氏体,力学性能满足技术协议要求且综合性能优良。Continuous cooling transformation behavior of austenite of high properties rare-earth-microalloyed BTP500 steel plate was studied to clarify the phase types obtained under different cooling rates and the specific conditions for obtaining martensite of the designed BTP500 steel plate,and then to carry out small scale industrial trial production.The results show that the transformations of ferrite+pearlite(A→F+P),bainite(A→B)and martensite(A→M)occurr respectively during the continuous cooling process of the RE microalloyed BTP500 steel plate under different cooling rates.The critical cooling rate of BTP500 steel plate to obtain complete martensite is determined as 7℃/s by the CCT curve.Microstructure of industrial trial produced BTP500 steel plate by quenching at 780℃ and tempering at 210℃ is martensite,the mechanical properties meet the technical requirements and the comprehensive performance is excellent.

关 键 词：BTP500钢 稀土微合金化 显微组织 马氏体 CCT曲线 

分 类 号：TG142[一般工业技术—材料科学与工程]