Title: Prediction of internal stresses in large-size work pieces during intensive quenching based on temperature–microstructure–stress coupled model

Authors: Wei Shi, Zhuang Liu, Kefu Yao

Addresses: Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China. ' Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China. ' Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

Abstract: Stress-induced transformation and transformation plasticity of 26Cr2Ni4MoV (0.25%C–1.75%Cr–3.3%Ni-0.4%Mo–0.14%V) and 30Cr1Mo1V (0.30%C–1.2%Cr–1.15%Mo–0.24%V) steel were investigated via dilatometric tests under applied external loads. The influence of stresses on diffusive transformations is described by a modified John-Mehl-Avrami formula, stress-induced non-diffusion transformation is governed by a modified Koinstinen-Marburger formula. A temperature-microstructure-stress coupled model was developed under the framework of thermo-elastic-plastic theory. The distributions of residual stress in hollow cylinders after quenching were measured to validate the model. The internal stresses during quenching of a turbine rotor with grooves and a generator rotor were analysed with an in-house FEM code.

Keywords: intensive quenching; stress-induced transformation; transformation plasticity; internal stresses; temperature; microstructure; thermo-elastic-plastic theory; residual stress; hollow cylinders; turbine rotors; generator rotors; FEM; finite element method; large workpieces.

DOI: 10.1504/IJMPT.2005.007963

International Journal of Materials and Product Technology, 2005 Vol.24 No.1/2/3/4, pp.385 - 396

Published online: 06 Oct 2005 *

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