THERMAL FATIGUE CRACK IN 5CrMnMo STEEL

Acta Metall Sin

1990, Vol. 26

Issue (4): 62-65 DOI:

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THERMAL FATIGUE CRACK IN 5CrMnMo STEEL

HE Shiyu;LI Ying;LIU Jianhong Harbin Institute of Technology Faculty of Metal;Harbin Institute of Technology; Harbin

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HE Shiyu;LI Ying;LIU Jianhong Harbin Institute of Technology Faculty of Metal;Harbin Institute of Technology; Harbin. THERMAL FATIGUE CRACK IN 5CrMnMo STEEL. Acta Metall Sin, 1990, 26(4): 62-65.

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Abstract The thermal fatigue behaviour of 5CrMnMo steel after various heattreatments has been examined by means of Coffin-model and self-strained thermalfatigue testing machines, The thermal fatigue crack initiation and propagation havebeen observed under SEM and TEM. The majority of thermal fatigue crack was in-itiated through the grain boundaries for the quenched steel and through the breakof interface between carbide and matrix or crack of grain boundary for quenchedand tempered one. The thermal fatigue crack propagated mainly through the break-age of the interface of carbide and grain boundaries for either quenched or quen-ched and tempered steel.

Key words: thermal fatigue carbide grain grain boundary

Received: 18 April 1990

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1990/V26/I4/62

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