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首页> 外文会议>Asian Pacific conference for fracture and strength'99 (APCFS'99) >FATIGUE STRENGTH OF HEAT AFFECTED ZONE OF CAST STEEL BY REPEATED HARDFACING
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FATIGUE STRENGTH OF HEAT AFFECTED ZONE OF CAST STEEL BY REPEATED HARDFACING

机译：重复硬化处理对铸钢热影响区的疲劳强度

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摘要

Hardfacing is frequently used to extend the service lifernof various machine’s parts which could be damaged byrnwear or cracking. Hardfaced metal has high strength andrnhardness to improve the mechanical properties of basernmetal. However, the hardfaced layer suffers the heatrncycle due to hardfacing, resulting in change of itsrnmicrostructure and strength as the heat affected zone inrnweldment. When the hardfacing is applied repeatedly onrnseveral times, the service life of the parts do not dependrnon the properties of hardfaced metal, but on therndegradation of heat affected zone.rnIn this study, we analyzed the degradation of a castrnsteel by welding heat cycle of hardfacing repeated on 7rntimes. The microstructural change and the variation ofrnhardness of heat affected zone was investigated forrnhardfacing of each time with the specimen made by realrnhardfacing. Fatigue strength test was performed with thernspecimen made by metal thermal cycle simulation.rnFatigue crack propagation test was also performed withrnthe specimen of real hardfacing. The results of S-N curvernand crack propagation rate was discussed in relation withrnthe metallurgy of hardfacing.
机译：堆焊经常用于延长机器各个零件的使用寿命，这些零件可能会因磨损或破裂而损坏。硬面金属具有高强度和硬度，可改善贱金属的机械性能。然而，由于表面硬化，表面硬化层遭受热循环，随着热影响区的加入，导致其微观结构和强度的变化。当多次重复进行堆焊时，零件的使用寿命并不取决于堆焊金属的性能，而取决于热影响区的降解。在这项研究中，我们通过反复焊接堆焊的热循环来分析铸钢的退化。在7rntimes。用实地堆焊制备的试样对每次热堆焊表面进行了显微组织变化和硬度变化研究。用金属热循环模拟制成的试样进行疲劳强度试验。还对实际堆焊的试样进行疲劳裂纹扩展试验。结合堆焊冶金学讨论了S-N曲线和裂纹扩展速率的结果。

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