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《International Journal of Minerals Metallurgy and Materials》 2017年09期
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Effects of mechanical strain amplitude on the isothermal fatigue behavior of H13

Yan Zeng  Peng-peng Zuo  Xiao-chun Wu  Shu-wen Xia  
【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.
【作者单位】School
【关键词】tool steel hardness microstructure isothermal fatigue mechanical strain
【基金】:financially supported by the National Key R&D Program of China (Grant Nos. 2016YFB0300400 and 2016YFB0300402)
【分类号】:TG142.1
【正文快照】:
After heat treatment,all the samples were machined tothe standard shape and size for the IF tests,as shown in Fig.1,with a gage length of 36 mm and a gage diameter of 6mm.The samples were ground and polished to reduce theirsurface roughness to avoid prem

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