通过考察不同氢含量GH690合金的断裂韧性,探讨了氢对该合金断裂韧性和断裂行为的影响规律.结果表明,随着氢含量的提高,合金的断裂韧性逐渐降低,断口形貌由穿晶断裂转变为沿晶断裂.研究发现氢富集于晶界碳化物与基体界面处形成的空洞是导致合金断裂韧性降低的主要原因,且合金的氢含量越高,空洞增大的趋势越明显,从而导致合金抵抗裂纹扩展的能力越差,故断裂韧性越低.
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