【摘 要】
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In situ fatigue tests in special designed SEM were conducted to trace the whole process of crack initiation andpropagation till to fracture in nickel-base P/M s
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In situ fatigue tests in special designed SEM were conducted to trace the whole process of crack initiation andpropagation till to fracture in nickel-base P/M superalloy seeded inclusions. The experimental results show that non-metallicinclusions can induce crack initiation. When the inclusion size is larger than the critical one, the crack can propagate as themain crack that induces the specimen to fracture. As a result, the LCF life of the specimen decreases.
In situ fatigue tests in special designed SEM were conducted to trace the whole process of crack initiation and propagation till fracture to nickel-base P / M superalloy seeded inclusions. When the inclusion size is larger than the critical one, the crack can propagate as the main crack that induces the specimen to fracture. a result, the LCF life of the specimen decreases.
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