THERMAL FATIGUE CRACKING IN STEEL 5CrMnMo

Abstract

Abstract: The thermal fatigue behaviour of steel 5CrMnMo after various heat treatments has been examined by means of Coffin-model and self-strained thermal fatigue testing machines.The thermal fatigue crack initiation and propagation have been observed under SEM and TEM. The majority of thermal fatigue cracks of the quenched samples initiated firstly at the grain boundaries and that of the quenched-tempered samples at the breakage interface of the car- bide and matrix.The thermal fatigue cracks of either quenched or quenched-tempered steel propagated mainly along the breakage interface of carbide and grain boundaries.

Key words: thermal fatigue crack, carbide, grain boundary

HE Shiyu LI Ying LIU Jianhong Harbin Institute of Technology,Harbin,China HE Shiyu,Faculty of Metal,Harbin Institute of Technology,Harbin,150006,China. THERMAL FATIGUE CRACKING IN STEEL 5CrMnMo[J]. Acta Metallurgica Sinica (English Letters), 1991, 4(1): 55-58.

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THERMAL FATIGUE CRACKING IN STEEL 5CrMnMo

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