Precipitation behavior of σ phase for reheated duplex stainless steel weld metal

被引：0

作者：

Nakade, K. ^{[1
]}

Ohe, K. ^{[1
]}

Kuroda, T. ^{[1
]}

机构：

[1] Joining and Welding Research, Institute of Osaka University, Ibaraki, Japan

来源：

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society | 2001年 / 19卷 / 01期

关键词：

Austenitic transformations - Composition effects - Ferrite - Precipitation (chemical) - Thermal effects;

D O I：

10.2207/qjjws.19.92

中图分类号：

学科分类号：

摘要：

Precipitation behavior of sigma (σ) phase was investigated for duplex stainless steel and its weld metals by reheating. The material used was SUS329J1 base metal, and the samples were single-pass welded using SMAW 329J4L (DP3) electrode and SMAW 329J3L (DP8) electrode. The fine secondary austenite (γ*) was formed at primary austenite (γ)/ferrite (α) phase boundaries and grew into ferrite, and then σ phase began to precipitate at γ*/σ phase boundaries and grew into ferrite for SUS329J1 base metal. In case of weld metals, γ* was formed both at γ/α phase boundaries and in the interior of ferrite matrix, and thereafter precipitation of σ phase at γ*(γ)/α phase boundaries occurred. Time-Temperature-Precipitation (T-T-P) diagrams of sigma (σ) phase were constructed in order to investigate beginning of precipitation of sigma (σ) phase for SUS329J1 base metal and 329J4L (DP3), 329J3L (DP8) weld metals. As a result, the nose position in TTP diagram of σ phase was located at 1123 K for 0.06 ks for 329J4L (DP3) weld metal, while its position was located at 1123 K for 0.3 ks in case of 329J3L (DP8) weld metal which was lower chromium content.

引用

页码：92 / 99