长期热老化对铸造奥氏体不锈钢断裂韧性的影响  

Effect of Long Term Aging on the Fracture Toughness of Cast Austenitic Stainless Steels

作　　者：王正品[1] 吴莉萍[1] 刘江南[1] 石崇哲[1] 

机构地区：[1]西安工业大学材料与化工学院,西安710032

出　　处：《西安工业大学学报》2012年第8期651-655,共5页Journal of Xi’an Technological University

摘　　要：为了研究热老化对铸造奥氏体不锈钢断裂韧性的影响及其微观机理,按照ASTME1820-05a等实验标准,采用标准C(T)试样对Z3CN20.09M铸造奥氏体不锈钢进行了热老化断裂韧性测量.结果表明:Z3CN20.09M铸造奥氏体不锈钢的断裂韧性随热老化时间的增加呈现下降趋势;通过SEM观察断口发现,断裂机制由原始态的微孔聚集型断裂转变为解理断裂和微孔聚集断裂的混合断裂;断裂韧性J值与热老化时间t满足幂指数关系.对该材料制造的主管道的热老化断裂韧性做出外推预测.The effect of long term aging on the fracture toughness of cast austenitic stainless steel and its micro-mechanism are studied. The fracture toughness for Z3CN20. 09M casting austenite stainless steel is obtained, measuring compact tension specimen according to the test criteria ASTM E1820-05a. The results show： Fracture toughness of austenitic stainless steel Z3CN20. 09M decreases with thermal aging time; The fracture forms mixed mode of cleavage fracture and microporous aggregation from microporous aggregation;Value J meets the exponential function of thermal aging time t. The extrapolation prediction of fracture toughness of the main tube of cast austenitic stainless steel is made by the authors.

关 键 词：热老化 铸造奥氏体不锈钢 断裂韧性 外推预测 

分 类 号：TG142.71[一般工业技术—材料科学与工程]