摘要
设计三种不同Mn含量(12%~20%)的LNG用超低温奥氏体高锰钢熔敷金属,采用OM、SEM、XRD分别对熔敷金属进行组织分析、断口观察和物相分析,测定低温冲击韧性。结果表明:Fe-(12~13)Mn熔敷金属显微组织为奥氏体(A)和α'马氏体(α'-M),Fe-20Mn熔敷金属的显微组织为全奥氏体(A)。室温下,A含量分别为78%、85%、96%、100%。Fe-(12~13)Mn熔敷金属在冲击过程中发生γ→α'-M相变,-196℃冲击吸收功分别为6.7 J、11.7 J,表现为脆性断裂。Fe-20Mn冲击试验后熔敷金属仍保持全奥氏体组织,-196℃平均冲击吸收功为67 J,断裂形式属于韧性断裂。控制和避免发生TRIP效应是超低温奥氏体高锰钢熔敷金属设计的关键。
Three different compositions of cryogenic aust-enitic high manganese steel(12~20wt.%Mn)deposited metal are designed for LNG.The OM,SEM and XRD were used for the microstructure analysis,fracture observation and phase analysis of deposited metal respectively.The results show that the microstructure of Fe-(12~13)Mn deposited metal is austenite andα'-martensite,and the microstructure of Fe-20Mn deposited metal is all austenite.At room temperature,the austenite contents of deposited metals are 78%,85%,96%and 100%respectively.The Fe-(12~13)Mn deposited metal undergoesγ→α'-M phase transformation during impact process,and the impact absorption energy at-196℃are 6.7 J and 11.7 J respectively,showing brittle fracture.After the Fe-20Mn impact test,the deposited metal still retains the full austenite microstructure,the average impact absorption energy at-196℃is 67 J,and the fracture form is ductile fracture.Controlling and avoiding TRIP effect is the key to the design of cryogenic austenitic high manganese steel deposited metal.
作者
孟亮
王红鸿
陈亚魁
孟庆润
汪昌红
MENG Liang;WANG Honghong;CHEN Yakui;MENG Qingrun;WANG Changhong(Collaborative Innovation Center for Advanced Steels,Wuhan University of Science and Techn-ology,Wuhan 430081,China;Wuhan Temo Welding Consu-mables Co.,Ltd.,Wuhan 430081,China)
出处
《电焊机》
2020年第11期120-123,I0008,共5页
Electric Welding Machine
基金
国家自然科学基金面上项目(51971165)。
关键词
LNG
熔敷金属
冲击韧性
奥氏体
马氏体相变
LNG
deposited metal
impact toughness
austenite
martensite transformation
