σ介金屬相對不銹鋼之性質劣化與改善

Degradation of Properties and Its Improvement of Stainless Steels Induced by Intermetallic Phase (σ)

謝鴻志(H.C. Hsieh) ； 林東毅(D.Y. Lin)

《鑛冶：中國鑛冶工程學會會刊》 49卷4期 (2005/12) Pp. 113-122+22

https://doi.org/10.30069/MM.200512_49(4).0009

摘要

在不銹鋼中有兩種常見的基本相，如：沃斯田鐵相（γ）、肥粒鐵相（δ），然而介金屬相對材料特性的影響卻往往被忽略掉。雖然不銹鋼中有許多的二次相，但是其中以σ相對不銹鋼銲接金屬的銲接熱裂、衝擊韌性、耐腐蝕性影響甚鉅，本文將對不銹鋼材料於高溫過程中，σ相的型態變化、析出機制與抑制方法作一番討論。作者極力地去闡明主要的δ／γ、δ／σ相變化行為，希望可以在不銹鋼之合金設計與熱處理上可以有一些貢獻。

關鍵字

介金屬相 ； δ-肥粒鐵 ； σ相 ； 銲接金屬 ； 相變心

並列摘要

There are two kinds of basic phases in stainless steels, such as austenitic and delta ferritic phases. However, the effect of intermetallic phases often were ignored for materials properties. In spite of most secondary phases in stainless steels, nevertheless, one is the σ phase that was detrimental due to hot cracking during welding, poor impact toughness, and low corrosion resistance in welded stainless steels. In this paper, the variation of morphologies, precipitation mechanism and retardation methods of sigma phase in welded stainless steels at high temperature will be introduced. The authors have urged to explain the primary phase transformation of δ/σ and δ/γ. Some contribution for the alloying design and heat treatment of stainless steels may be expected.

並列關鍵字

Intermetallic phase ； δ-ferrite ； σ-phase ； Weld metal ； Phase transformation