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。 JN1 austenitic steel 1348K solution treatment and 923, 973, 1073K aging 5h, 4K and 77K fracture toughness test results show that the steel has a significant aging embrittlement. Tissue observation and X-ray diffraction confirmed that aging embrittlement was caused by the precipitation of M23C6 carbides along grain boundaries and annealing twin boundaries.