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Vol.36, No.3, 377 ~ 385, 1998
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| Title |
| Effects of Cr , Mo , Nb and B Additions on Microstructure and Mechanical Properties in Fe-38at.%Al Alloys |
| 박광일 , 주성민 , 최한철 , 최답천 Kwang Il Park , Sung Min Joo , Han Cheol Choe , Dap Chun Choi |
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| Abstract |
| The changes in the microstructure, mechanical properties and Fracture mode were investigated for Fe-38at.%Al alloys when Cr, Mo, Nb and B were added. As the amount of B or Nb addition was increased, the grain size became smaller. The effects of Mo and Cr were not significant. Hardness and yield strength of Fe-38at.%Al alloy were decreased by adding 6%Cr. However Mo, Nb and B additions were increased. The fracture mode of Fe-38at.%A1 binary alloy was the typical intergranular fracture, but it was changed into the quasi-cleavage fracture mode by adding 6%Cr. In Fe-38Al-6Cr+Mo alloy, the fracture mode was changed into cleavage. The typical intergranular mode was observed in Nb added alloys where cracks propagated along the grain boundary precipitates. However, the fracture mode in B added alloys was the quasi-cleavage mode due to strengthening of grain boundaries. |
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