期刊
MATERIALS & DESIGN
卷 53, 期 -, 页码 349-356出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2013.06.070
关键词
Alloy steel; Plastic deformation; Deformation mechanism; Constitutive equation
资金
- Program for the 973 Program [2013CB035801]
- New Century Excellent Talents in University [NCET-10-0838]
- Sheng-hua Yu-ying Program of Central South University
- Postdoctoral Science Foundation of Central South University, China [117327]
The hot tensile deformation behaviors of 42CrMo steel are studied by uniaxial tensile tests with the temperature range of 850-1100 degrees C and strain rate range of 0.1-0.0001 s (1). The effects of hot forming process parameters (strain rate and deformation temperature) on the elongation to fracture, strain rate sensitivity and fracture characteristics are analyzed. The constitutive equation is established to predict the peak stress under elevated temperatures. It is found that the flow stress firstly increases to a peak value and then decreases, showing a dynamic flow softening. This is mainly attributed to the dynamic recrystallization and material damage during the hot tensile deformation. The deformation temperature corresponding to the maximum elongation to fracture increases with the increase of strain rate within the studied strain rate range. Under the strain rate range of 0.1-0.001 s (1), the localized necking causes the final fracture of specimens. While when the strain rate is 0.0001 s (1), the gage segment of specimens maintains the uniform macroscopic deformation. The damage degree induced by cavities becomes more and more serious with the increase of the deformation temperature. Additionally, the peak stresses predicted by the proposed model well agree with the measured results. (C) 2013 Elsevier Ltd. All rights reserved.
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