12MnNiCrMoV钢薄板粗晶区组织对其韧性的影响  

Effect of microstructure on CGHAZ performances of 12MnNiCrMoV steel sheet

作　　者：代雪佳[1] 吴松林[1] 成应晋 

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023

出　　处：《模具技术》2016年第3期58-63,共6页Die and Mould Technology

摘　　要：通过金相显微组织观察、硬度、冲击性能测试及热影响区热循环的有限元模拟,分析了12MnNiCrMoV钢薄板热影响区粗晶区金相显微组织、晶粒度对其强韧性以及硬度的影响。结果表明:低线能量输入时,粗晶区的组织为粒状贝氏体和块状铁素体,材料的冲击韧性和硬度较好;随着热输入能量的增大,粒状贝氏体向上贝氏体转变,且粗晶区的晶粒度减小、组织粗大,材料的冲击韧性和硬度均降低;粗晶脆化和组织脆化是12MnNiCrMoV钢薄板粗晶区韧性和硬度降低的主要原因。By optical observation of microstructure,hardness and impact resistance testing as well as finite element simulation of thermal cycling,the influences of CGHAZ（coarse grain heat affected zone） microstructure and grain size on the hardness and toughness of12 MnNiCrMoV steel sheet was analyzed.The results show that if line energy is low,the coarse grain zone are consist of granular bainite and massive ferrite,and CGHAZ has good impact toughness and hardness.As the line energy increases,granular bainite transforms to up bainite,and CGHAZ microstructure is coarse,resulting in low impact toughness and hardness.Microstructure brittleness and coarse grain are the main reason of toughness and hardness decrease of 12 MnNiCrMoV CGHAZ.

关 键 词：12MnNiCrMoV钢 粗晶区 晶粒度 低温韧性 

分 类 号：TG142.1[一般工业技术—材料科学与工程]