ホウ化処理鋼のX線残留応力測定

概要

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Boronizing is one of the chemical methods to achieve case hardening of steels. The boronized layer has above 1400 Vickers hardness and a high resistance especially against wear. In the present study, the X-ray method was successfully applied to measure the residual stress distribution in a boronized steel. The X-ray elastic constants were determined separately for FeB and Fe_2B phases of the boronized layer, and compared with the mechanically measured values. The results obtained are summarized as follows; (1) The X-ray elastic constants determined were S_1=9.10×10^<-7>(MPa^<-1>), S_2/2=2.93×10^<-6>(MPa^<-1>) for FeB (212) phase, and S_1=4.95×10^<-7>(MPa^<-1>), S_2/2=2.13×10^<-6>(MPa^<-1>) for Fe_2B (330) phase. The Young's modulus of FeB and Fe_2B phases were 494(GPa) and 611(GPa) which were higher than the mechanically determined values of 370(GPa) and 260(GPa), respectively. (2) The residual stress distribution determined by X-rays indicated high compressive stress above 2000(MPa) in the boronized layer. The effect of the boronizing process on the residual stress distribution was examined.
1983-01-15