ON THE THERMALLY ACTIVATED PLASTIC DEFORMATION OF 12Ni3CrMoVA STEEL

Acta Metall Sin

1991, Vol. 27

Issue (1): 61-67 DOI:

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ON THE THERMALLY ACTIVATED PLASTIC DEFORMATION OF 12Ni3CrMoVA STEEL

ZHU Dong;CAI Qigong Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing

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ZHU Dong;CAI Qigong Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing. ON THE THERMALLY ACTIVATED PLASTIC DEFORMATION OF 12Ni3CrMoVA STEEL. Acta Metall Sin, 1991, 27(1): 61-67.

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Abstract The 12Ni3CrMoVA steel was selected to investigate the effect of tem-perature, strain rate and microstructure on yield strength of bcc metals. The therma-lly activated parameters, such as activation energy and volume, were measured andcalculated. According to the P-N mechanism, the plastic deformation of bcc metalswas analysed by the core structure of screw dislocation, the theoretical predictionwas in good agreement with experimental results. It is explained that the "turningpoint" in curve of effective stress against temperature was caused by a double cam-el-hnmp--shape of Peierls potential energy, which resulted in a new pair of doublekinks forming in the front of original one. The microstructure can only affect on athermal stress, but not affect on thermally activated movement of dislocation.

Key words: activation deformation strain rate dislocation

Received: 18 January 1991

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1991/V27/I1/61

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