9Ni钢焊接热影响区组织转变规律的研究  

Study on Phase Transformation in Welding Heat Affected Zone of 9Ni Steel

作　　者：严春妍[1] 李午申[2] 白世武[3] 薛振奎[3] 

机构地区：[1]河海大学机电工程学院,江苏常州213022 [2]天津大学材料科学与工程学院,天津300072 [3]中国石油天然气管道科学研究院,河北廊坊065000

出　　处：《材料工程》2010年第2期6-9,共4页Journal of Materials Engineering

摘　　要：采用热模拟技术研究了液化天然气储罐用9Ni钢焊接热影响区的组织转变规律。实验结果表明,9Ni钢经历热循环后的显微组织类型包括贝氏体和马氏体两种。低冷却速度条件下,9Ni钢经历热循环后的主要转变产物为贝氏体(包括粒状贝氏体和上贝氏体两种类型);随着冷却速度的提高,组织类型由粒状贝氏体向上贝氏体转化。高冷却速度条件下,经历热循环后的转变产物为马氏体。Thermal simulation with Gleeble was performed to investigate phase transformation in the heat affected zone of 9Ni steel for liquefied natural gas storage tanks. Results showed that bainite and martensite might be obtained after experiencing heat cycles. With low cooling rates, a mainly bainitie microstructure（including granular bainite and upper bainite） developed after experiencing heat cycles. When cooling rate increased, granular bainite was more likely to generate than upper bainite. With high cooling rates, a mainly martensitic mierostructure developed after experiencing heat cycles.

关 键 词：9NI钢 组织转变 热影响区 

分 类 号：TG142.79[一般工业技术—材料科学与工程]