摘要
ＪＮ１ 奥氏体钢１３４８Ｋ固溶处理与９２３ 、９７３ 、１０７３Ｋ 时效５ｈ 后，４Ｋ 及７７Ｋ 断裂韧度测定结果表明，该钢有明显的时效脆化倾向。组织观察及Ｘ 射线衍射结果确认，时效脆化是Ｍ２３Ｃ６ 型碳化物沿晶界及退火孪晶界析出造成的。
Fracture toughness tests were conducted at 4K and 77K for specimens of JN1 austenitic steel aged at 923,973 and 1073K for 5 hours. Comparison with the fracture toughness values of specimens solution treated showed a considerable aging induced embrittlement in this steel. The results of microstructure observation and X ray diffraction showed that the embrittlement is due to the precipitation of M\-\{23\}C\-6 carbide along grain boundry and annealing twin boundary.
关键词
奥氏体钢
超低温断裂韧度
时效脆化
austenitic steel,\ cryogenic fracture toughness,\ aging embrittlement,\ grain boundary precipitation
