PARTICLE BOUNDARIES AND FRACTURE OF A POWDER METALLURGY SUPERALLOY

Abstract

Abstract: Nature of PPB precipitation of P/M Rene'95 and its effects on mechanical properties,frac- ture morphology and microfracture characteristics are discussed.Dense PPB precipitates make the boundaries brittle and lower the plasticity of the alloy.Fracture path is along the boundaries of particles.As PPB parameter increases,the interfaces between particles are strengthened.The fracture mode is changed from interparticle to transparticle.As a result,the plasticity at high temperatures and stress rupture life of the alloy are improved.

Key words: Rene'95, superalloy, powder metallurgy, fracture

MAO Jian YANG Wanhong WANG Wuxiang ZOU Jinwen ZHOU Ruifa Beijing Institute of Aeronautical Materials,Beijing,China MAO Jian,senior engineer,Beijing Institute of Aeronautical Materials,Beijing 100095,China. PARTICLE BOUNDARIES AND FRACTURE OF A POWDER METALLURGY SUPERALLOY[J]. Acta Metallurgica Sinica (English Letters), 1993, 6(5): 346-351.

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PARTICLE BOUNDARIES AND FRACTURE OF A POWDER METALLURGY SUPERALLOY

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