ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Effect of R Phase Formation on the Impact Toughness of a 25%Cr-7%Ni-3%Mo Duplex Stainless Steel
Yukio ShimoideJie CuiChang-Yong KangKazuya Miyahara
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1999 Volume 39 Issue 2 Pages 191-194

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Abstract

The aging behavior (microstructural evolution and mechanical properties change) of a 25%Cr-7%Ni-3%Mo duplex stainless steel at 873 K was investigated. A very short term (3.6 ks) aging treatment caused a significant decrease of impact toughness before the formation of σ phase. Quasi-stable R phase was observed to form locally in the material aged for 3.6 ks. These results indicate that the significant loss of impact toughness due to the R phase formation at the very early stage of aging occurs before the embrittlement due to the σ phase.

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© The Iron and Steel Institute of Japan
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