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用相同的试验方法和条件,对比了15CrMnMoV、30CrMnMoV、45CrMnMOV(D6AC),30Cr3SiNiMoV、28Cr3SiNiMoWV、30CrMnSiNiMoV、30SiMnCrMoV、40SiMnCrNiMoV(300M)等八种钢在5％NaCl水溶液中的K_(ISCC)和其它性能,并用扫描电镜、透射电镜、定量金相等手段观察了断口形貌和微观组织。结果说明:(1)限制第二相质点的大小、形状和分布是提高抗氢脆、抗应力腐蚀性能的一个重要方法。30SiMnCrNiMoV和45CrMnMoV钢在950℃固溶,粗大碳化物基本溶解,平均直径达到临界尺寸,基体是低碳板条状马氏体和索氏体。在σ_(0.2)=140～150kgf/mm~2的情况下,具有良好的
The K_ (ISCC) and other properties of eight kinds of steels including 15CrMnMoV, 30CrMnMoV, 45CrMnMOV (D6AC), 30Cr3SiNiMoV, 28Cr3SiNiMoWV, 30CrMnSiNiMoV, 30SiMnCrMoV and 40SiMnCrNiMoV (300M) in 5% NaCl aqueous solution were compared by the same test methods and conditions. The morphology and microstructure of the fracture were observed by scanning electron microscopy, transmission electron microscopy and quantitative metallography. The results show that: (1) Limiting the size, shape and distribution of the second phase particles is an important method to improve the resistance to hydrogen embrittlement and stress corrosion resistance. 30SiMnCrNiMoV and 45CrMnMoV steel solution at 950 ℃, the basic dissolution of coarse carbides, the average diameter of the critical size, the matrix is low-carbon lath martensite and sorbite. In the case of σ_ (0.2) = 140 to 150 kgf / mm ~ 2, it is good