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Effect of Sulfur Content and Sulfide Shape on Fracture Ductility in Case Hardening Steel 被引量:6
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作者 XIAO Guo-hua DONG Han WANG Mao-qiu HUI Wei-jun 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2011年第8期58-64,共7页
The effects of sulfur content and calcium addition on smooth axisymmetric tensile fracture ductility of case hardening steel DIN 18CrNiMo7-6 have been investigated. The quantitative metallographic analysis of sulfide ... The effects of sulfur content and calcium addition on smooth axisymmetric tensile fracture ductility of case hardening steel DIN 18CrNiMo7-6 have been investigated. The quantitative metallographic analysis of sulfide inclusions and the correlations between sulfide inclusions and fracture ductility were examined. Sulfide inclusions were found to have deleterious effect on fracture ductility, whereas the effect can be offset to some extent by calcium-treat- ment due to less easily deforming of sulfides during hot-working. The product (AA·λAW) of sulfide inclusion area fraction (An) and its area-weighted aspect ratio (λAW) can be used as a parameter to describe the effect of sulfide inclusions on fracture true strain. 展开更多
关键词 case hardening steel calcium treatment SULFIDE fracture ductility
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Comparison of microstructure and heat treatment distortion of gear steels with and without Nb addition 被引量:3
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作者 Guo-qiang Zhang Xiao-fei He +2 位作者 Qian-zhen Zhang Wen-jun Wang Mao-qiu Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2021年第4期488-495,共8页
In order to research the effect of microalloying Nb,the microstructure and heat treatment distortion of case carburizing steels with and without Nb addition are compared.Results show that a uniform and fine prior aust... In order to research the effect of microalloying Nb,the microstructure and heat treatment distortion of case carburizing steels with and without Nb addition are compared.Results show that a uniform and fine prior austenite grain size was obtained for the steel with the addition of 0.03 wt.%Nb even after being carburized at 980℃for 37 h,resulting in a very deep hardened layer of about 4 mm.Nb is an effective microalloying element to hinder austenite grain growth of gears during high-temperature carburizing.Theoretical calculation and experimental observation of NbC precipitates indicate that fine NbC precipitates have not evidently dissolved at 980℃,and thus they can act as grain refiners due to pinning effect.Heat treatment distortion of Nb-added steel is much lower than that of the steel without Nb addition.It may be contributed to its fine and uniform grain size,which presumably influences stress during martensitic transformation. 展开更多
关键词 case hardening steel High-temperature carburizing Grain size Heat treatment distortion MICROSTRUCTURE
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Rolling Contact Fatigue Properties of SAE 8620 Steel after Case Carburizing 被引量:3
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作者 Yan-guang CAO Le XU +2 位作者 Gou-qiang ZHANG Jie SHI Mao-qiu WANG 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2016年第7期711-716,共6页
Rolling contact fatigue(RCF)properties of SAE 8620 steel after case carburizing have been investigated under two contact stresses of 4.0and 5.5GPa.Results show that the RCF life ranges from 2.5×10^6 to 3×1... Rolling contact fatigue(RCF)properties of SAE 8620 steel after case carburizing have been investigated under two contact stresses of 4.0and 5.5GPa.Results show that the RCF life ranges from 2.5×10^6 to 3×10^7 cycles under the contact stress of 5.5GPa,while it can be more than 1×10^8 cycles under the contact stress of 4.0GPa.The rated fatigue life L_(10)(lives with the 10%failure)is also drastically shortened from 9.8×10^6 to 5.4×10^5 cycles when the contact stress is increased from 4.0to 5.5GPa.Theoretical calculations and fractographs show that the maximum shear stress and the contact area increase with increasing the contact stress,making RCF tend to occur earlier. 展开更多
关键词 case hardening steel carburizing rolling contact fatigue contact stress SAE 8620steel
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