J. Mater. Sci. Technol. ›› 1991, Vol. 7 ›› Issue (1): 40-46.

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Effect of Y-containing Phase in Fe-20Cr-4Al-Y Alloys on Microstructure and Embrittlement

LI Bei YAN Yuxin MENG Guang'en WU Shuangxia TANG Fenghuang Baotou Research Institute of Rare Earth,Baotou,014010,China.To whom correspondence should be addressed.   

  1. BaotouResearchInstituteofRareEarth,Baotou,014010,China.Towhomcorrespondenceshouldbeaddressed.;BaotouResearchInstituteofRareEarth,Baotou014010,China.;BaotouResearchInstituteofRareEarth,Baotou014010,China.;BaotouResearchInstituteofRareEarth,Baotou014010,China.;BaotouResearchInstituteofRareEarth,Baotou014010,China.
  • 收稿日期:1991-01-28 修回日期:1991-01-28 出版日期:1991-01-28 发布日期:2009-10-10

Effect of Y-containing Phase in Fe-20Cr-4Al-Y Alloys on Microstructure and Embrittlement

LI Bei YAN Yuxin MENG Guang'en WU Shuangxia TANG Fenghuang Baotou Research Institute of Rare Earth,Baotou,014010,China.To whom correspondence should be addressed.   

  • Received:1991-01-28 Revised:1991-01-28 Online:1991-01-28 Published:2009-10-10

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摘要： <正> In Fe-20Cr-4Al-0.5Si-(0.13-0.73)Y alloys,anew phase consisting of 15.8 wt-% Y,65.4wt-% Fe,12.6 wt-% Cr,4.4 wt-% Al and 1.4wt-% Si was observed with its Y-content and crys-tal structure being identical with those ofYFe_9 phase basically and the microhardness being4-5 times higher than that of α-phase matrix.It is akind of stable particles (2-10 μm) dispersed overthe matrix.For Y-free or less alloy,the plasticity droppedsharply after high temperature treatment,while theplasticity is retained for the alloys containing0.41-0.73 wt-% Y treated below 1340℃,becausethe Y-containing particles can strongly preventfrom grain growth,and dislocation annihilation,and trap impurities.If treatment temperature ishigher than 1340℃,however,these actions will dis-appear owing to the melting of the particles.

Abstract: In Fe-20Cr-4Al-0.5Si-(0.13-0.73)Y alloys,a new phase consisting of 15.8 wt-% Y,65.4 wt-% Fe,12.6 wt-% Cr,4.4 wt-% Al and 1.4 wt-% Si was observed with its Y-content and crys- tal structure being identical with those of YFe_9 phase basically and the microhardness being 4-5 times higher than that of α-phase matrix.It is a kind of stable particles (2-10 μm) dispersed over the matrix. For Y-free or less alloy,the plasticity dropped sharply after high temperature treatment,while the plasticity is retained for the alloys containing 0.41-0.73 wt-% Y treated below 1340℃,because the Y-containing particles can strongly prevent from grain growth,and dislocation annihilation, and trap impurities.If treatment temperature is higher than 1340℃,however,these actions will dis- appear owing to the melting of the particles.

Key words: Fe-Cr-AI-Y alloy, embrittlement, microstructure