M_s点以上保温时T91钢的奥氏体稳定化过程  

Austenitic Stability Process of T91 Steel Held Isothermally above M_s

作　　者：宁保群[1,2] 严泽生[3] 付继成[3] 赵捷[1] 刘永长[2] 

机构地区：[1]天津理工大学材料科学与工程学院,天津300191 [2]天津大学材料科学与工程学院,天津300072 [3]天津钢管集团股份有限公司,天津300301

出　　处：《材料科学与工程学报》2011年第1期21-24,共4页Journal of Materials Science and Engineering

基　　金：国家自然科学基金钢铁联合基金重点资助项目(50834011);天津市高等学校科技发展基金计划资助项目(20080310);东北大学轧制技术及连轧自动化国家重点实验室开放课题基金资助项目(2009011)

摘　　要：利用高精度差分膨胀仪对冷却过程中T91钢奥氏体稳定化的相变行为进行分析,研究了在Ms点以上温度保温时奥氏体稳定化现象对T91钢马氏体转变开始温度的影响。研究表明:在T91钢Ms点以上较高温度保温时,出现马氏体转变开始温度高于Ms点的明显的反稳定化现象,并随保温时间延长反稳定化程度增加;在Ms点以上较低温度保温时,T91钢的马氏体转变开始温度低于Ms点,且随保温时间的延长继续降低,而其最终组织仍为完全马氏体。The influences of austenitic stability on the starting temperature of the martensite transformation for T91 steel were studied by using a differential dilatometer.The results show that when isothermal holding temperature was higher than the upper M_s,T91 steel possesses obvious anti-stabilization characterization.The anti-stabilization has a stronger tendency with prolonging the holding time.On the other hand,when isothermal holding temperature is just higher than M_s,the martensite start temperature of T91 steel is lower than M_s,and it decreases continuously with prolonging holding time,but final structure keeps completely martensite.

关 键 词：T91钢 奥氏体稳定化 马氏体转变开始温度 

分 类 号：TG142.73[一般工业技术—材料科学与工程] TG142.23[金属学及工艺—金属材料]