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pISSN : 1598-706X / eISSN : 2288-8381


(논문)연구논문

한국주조공학회지 (15권5호 469-476)

Effects of Cr, Mo an B additions on the microstructure and mechanical properties of Fe-28at.%Al alloys

Fe-28at.%Al 합금의 미세조직과 기계적 성질에 미치는 Cr, Mo 및 B의 영향

Dap-Chun Choi, Yeon-O Lee, Kwan-Hyu Kim, Eun-Sik Park, Ho-Jong Lee*

Chonnam National Univ., *Suncheon National Univ.

Abstract

The effects of Cr, Mo or B additions were investigated on B2<->DO_3 structural transition temperature (T_C) and mechanical properties of Fe- 28at.%Al. The raw materials were arc-melted in vacuum and then subjected to the following heat-treatments to maximize the $DO_3$ 수식 이미지 ordered structure : 1000℃/7days, slowly cooled to 500℃ and then held for 5 days. In the effect on the grain refinment, the addition of alloying element B was the most effective. The addition of Cr or Mo had little effect. When 1at.%Mo was added, T_c increase about 30℃, but Cr had a very little effect on T_c. On the contrary, when B was added, T_c was apt to come down minutely. In the additional effect of alloying element on the mechanical properties, Cr was apt to decrease the microvickers hardness and yield strength, Mo and B didn't have much effect. In the case of compressure strength test, the effect of the environment on the yield strength was contrary to the result of the tensile strength test.

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