Austenitic Steel의 Dendrite 組織에 관한 연구

Abstract

본 실험에서는 dendrite 조직에 미치는 응고속도의 영향과 이들 조직에 따른 기계적 성질의 변화관계 및 그 이유를 austenitic steel인 AISI 304 stainless steel 에 대하여 조사하였다.

그 결과 다음의 결론을 구하였다.

1.dendrite arm spacing은 냉각속도가 감소할수록 커진다.

2.dendrite arm spacing이 작을수록 硬度(hardness)는 증가하며, 이는 탄화물［CrㆍFe)₄ C］의 interdendritic region 분포에 기인하는 것으로 보인다.

The cooling rate dependence of the development of the dendrite structure in austenitic steel and the dffect of the dendrite structure on the mechanical properties of the austenitic steel have been investigated. And the following conclusions were obtained from the experimental results;

1.The dendrite arm spacing increases with decreasing cooling rate.

2.The hardness increases with decreasing dendrite arm spacing and this phenomena could be explained on the basis that carbide ［CrㆍFe)₄C］ is distributed in the interdendritic region.

The cooling rate dependence of the development of the dendrite structure in austenitic steel and the dffect of the dendrite structure on the mechanical properties of the austenitic steel have been investigated. And the following conclusions were obtained from the experimental results;

1.The dendrite arm spacing increases with decreasing cooling rate.

2.The hardness increases with decreasing dendrite arm spacing and this phenomena could be explained on the basis that carbide ［CrㆍFe)₄C］ is distributed in the interdendritic region.