Original scientific paper
Unified Theory of Transformation Plasticity and the Effect on Quenching Simulation
Tatsou INOUE
; Department of Mechanical Systems Engineering, Fukuyama University, Gakuen-cho 1, Fukuyama, Japan
Hideto WAKAMATSU
; Department of Mechanical Systems Engineering, Fukuyama University, Gakuen-cho 1, Fukuyama, Japan
Abstract
A phenomenological mechanism of transformation plasticity (TP) is
discussed, in the first part of the paper, why it takes place under a stress
level even lower than the characteristic yield stress of mother phase: This
is principally based on the difference in thermal expansion coefficient in
both phases. Bearing in mind that it is also a kind of plastic strain, a unified
plastic flow theory is derived by introducing the effect of progressing new
phase into the yield function of stress, temperature and plasticity related
parameters. Experimental results of the TP coefficient will be shown in
the following section for some steels under tensile and compressive stress.
As examples of the application of the theory and the data, metallo-thermo-
mechanical simulation for a quenched blank gear wheel is executed to
demonstrate the effect of TP.
Keywords
Metallo-thermo-mechanics; Quenching; Transformation plasticity; Unified transformation-thermoplasticity theory
Hrčak ID:
74519
URI
Publication date:
28.2.2011.
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