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Acta Metall Sin  2006, Vol. 42 Issue (2): 153-157     DOI:
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Effects of Atomic Hydrogen and Flaking on Mechanical Properties of Wheel Steel
Xuechong Ren;
北京科技大学材料科学与工程学院
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Xuechong Ren. Effects of Atomic Hydrogen and Flaking on Mechanical Properties of Wheel Steel. Acta Metall Sin, 2006, 42(2): 153-157 .

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Abstract  The effects of atomic hydrogen and flaking on mechanical properties of a wheel steel have been investigated. The results show the critical diffusible hydrogen concentration for forming flaking is C*0=1.3×10-6(or total hydrogen concentration C*T=3.7×10-6). If the amount of the flacking exceeds a critical value,e.g., C0≥5.6×10-6, it causes the plasticity and strength to decrease sharply. For a wheel, the amount of flaking is below the critical value because of C0<3.9×10-6,thus there is no effect of flaking on tensile properties and fracture toughness KIC. Atomic hydrogen doesn’t influence fracture toughness, but causes plasticity to decrease evidently during slow strain rate tension. Atomic hydrogen can also causes hydrogen –induced delayed cracking under constant deflection loading and the threshold stress intensity factor of hydrogen –induced delayed cracking, KIH, decreases linearly with increasing diffusible hydrogen concentration i.e., KIH=57.8-3.9 C0. However there is no effect of the flaking on hydrogen-induced delayed cracking
Key words:  wheel steel      flaking      atomic hydrogen      hydrogen –induced delayed cracking      
Received:  10 May 2005     
ZTFLH:  TB383  
  TG111.91  

URL: 

https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2006/V42/I2/153

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