| Effects of mechanical strain amplitude on the isothermal fatigue behavior of H13 |
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| 作者姓名： | Yan Zeng Peng-peng Zuo Xiao-chun Wu Shu-wen Xia |
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| 作者单位： | School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China |
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| 基金项目： | This work was financially supported by the National Key R&D Program of China (Grant .2016YFB0300400 and 2016YFB0300402) |
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| 摘 要： | Isothermal fatigue (IF) tests were performed on H13 tool steel subjected to three different mechanical strain amplitudes at a constant temperature to determine the effects of mechanical strain amplitude on the microstructure of the steel samples. The samples' extent of damage after IF tests was compared by observation of their cracks and calculation of their damage parameters. Optical microscopy (OM) and scanning electron microscopy (SEM) were used to observe the microstructure of the samples. Cracks were observed to initiate at the surface because the strains and stresses there were the largest during thermal cycling. Mechanical strain accelerated the damage and softening of the steel. A larger mechanical strain caused greater deformation of the steel, which made the precipitated carbides easier to gather and grow along the deformation direction, possibly resulting in softening of the material or the initiation of cracks.
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| 关 键 词： | tool steel hardness microstructure isothermal fatigue mechanical strain |
Effects of mechanical strain amplitude on the isothermal fatigue behavior of H13 |
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| Yan Zeng,Peng-peng Zuo,Xiao-chun Wu,Shu-wen Xia.Effects of mechanical strain amplitude on the isothermal fatigue behavior of H13[J].International Journal of Minerals,Metallurgy and Materials,2017,24(9):1004-1009. |
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| Authors: | Yan Zeng Peng-peng Zuo Xiao-chun Wu Shu-wen Xia |
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| Affiliation: | School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China |
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| Abstract: | Isothermal fatigue (IF) tests were performed on H13 tool steel subjected to three different mechanical strain amplitudes at a constant temperature to determine the effects of mechanical strain amplitude on the microstructure of the steel samples.The samples' extent of damage after IF tests was compared by observation of their cracks and calculation of their damage parameters.Optical microscopy (OM) and scanning electron microscopy (SEM) were used to observe the microstructure of the samples.Cracks were observed to initiate at the surface because the strains and stresses there were the largest during thermal cycling.Mechanical strain accelerated the damage and softening of the steel.A larger mechanical strain caused greater deformation of the steel,which made the precipitated carbides easier to gather and grow along the deformation direction,possibly resulting in softening of the material or the initiation of cracks. |
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| Keywords: | tool steel hardness microstructure isothermal fatigue mechanical strain |
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