| Influence of Different Surface Treatments of H13 Hot Work Die Steel on Its Thermal Fatigue Behaviors |
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| 作者姓名： | MINYong－an WUXiao－chun |
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| 作者单位： | SchoolofMaterialsScienceandEngineering,ShanghaiUniversity,Shanghai200072,China |
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| 基金项目： | SupportedbytheScienceFoundationofShanghaiMunicipalCommissionofScienceandTechnology ( 9910 0 70 0 3)andFundCommitteeofUddeholmCo . |
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| 摘 要： | Thermal fatigue checking is general failure of hot work die steels,which is relative with the structures and properties of the steels and the stress alternated during the employment.The Uddeholm test method on thermal fatigue is used to compare the behaviors of different samples,which are treated with plasma nitriding 、plasma sulfur-carbon-nitriding、boronizing or not treated.The results show that the nitriding improves the thermal fatigue property of the tool steel,while the plasma sulfur-carbon-nitriding and the boronizing impair the property.The mechanisms are induced as follows .By increasing the hardness and changing the stress distribution in the surface layer,surface treatment can decrease the plastic deformation and the temsile stress during the cycling.Therefore,the generation and growth of the cracks are restrained.On the other hand,as results of surface treating,in the surface layer the toughness declines and the expanding coefficient ascendes;the latter change caused the strengthening of the tensile and compressive stress during the cycling.Thus the resistance to thermal fatigue is weakened.Whether or not the surface treatment is favor to thermal fatigue of tool steels relies on which factor is dominant.
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| 关 键 词： | 钢 表面处理 热疲劳 CVD处理 |
| 收稿时间： | 19 March 2001 |
Influence of different surface treatments of H13 hot work die steel on its thermal fatigue behaviors |
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| Yong-an Min Ph. D. Candidate,Xiao-chun Wu,Luo-ping Xu,Wen-jun Tang,Shuang-ke Zhang,G. Wallner,David Liang,Ying-yu Feng.Influence of Different Surface Treatments of H13 Hot Work Die Steel on Its Thermal Fatigue Behaviors[J].Journal of Shanghai University(English Edition),2001,5(4):326-330. |
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| Authors: | Yong-an Min Ph D Candidate Xiao-chun Wu Luo-ping Xu Wen-jun Tang Shuang-ke Zhang G Wallner David Liang Ying-yu Feng |
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| Institution: | 1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
2. Uddeholm Tooling AB, Sweden |
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| Abstract: | Thermal fatigue checking is the general failure of hot work die steels, which is relative with the structures and properties
of the steels and the stress alternated during the employment. The Uddeholm test method on thermal fatigue is used to compare
the behaviors of different samples, which are treated with plasma nitriding, plasma sulfur-carbon-nitriding, boronizing or
not treated. The results show that the nitriding improves the thermal fatigue property of the tool steel, while the plasma
sulfur-carbon-nitriding and the boronizing impair the property. The mechanisms are induced as follows. By increasing the hardness
and changing the stress distribution in the surface layer, surface treatment can decrease the plastic deformation and the
tensile stress during the cycling. Therefore, the generation and growth of the cracks are restrained. On the other hand, as
results of surface treating, in the surface layer the toughness declines and the expanding coefficient ascendes; the latter
change caused the strengthening of the tensile and compressive stress during the cycling. Thus the resistance to thermal fatigue
is weakened. Whether or not the surface treatment is favor to thermal fatigue of tool steels relies on which factor is dominant.
Supported by the Science Foundation of Shanghai Municipal Commission of Science and Technology (991007003) and Fund Committee
of Uddeholm Co. |
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| Keywords: | thermal fatigue hot work die surface treatment |
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