Carbide Precipitation in 18-8 Stainless Steel Stabilized by Titanium During Heat-Treatment

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  • Miyoshi Eiji
    Sumitomo Metal Industries, Ltd., Central Research Laboratories

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  • 18-8 Tiステンレス鋼中の炭化物の挙動と熱処理の関係について
  • 18-8Ti ステンレス コウ チュウ ノ タンカブツ ノ キョドウ ト ネツ ショリ ノ カンケイ ニ ツイテ

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Abstract

It is well known that the creep-rupture characteristics of 18-8 stainless steel stabilized by titanium is remarkably affected by its preliminary heat treatment. This is a part of the study persuing the reason of this characters from the metallographical point of view. The relation between carbide precipitated in steel and its heat treatment was studied. Carbides were extracted from steel and their composition was chemically analysed. Preliminarily all the samples were solution treated at the highest temperature of 1300°C, in order to eliminate effects of the carbide-residue in steel and grain size. The carbon and titanium contents change with the heating temperature and duration. Maximum precipitation was observed over the temperature range of 800° to 950°C. The titanium content dissolved in steel promote the carbide precipitation. The chromium content in carbides showed the maximum in steel containing a larger amount of titanium at the initial stage of heating at 700°C. The preliminary solution treatment at higher temperatures delays the initiation of the carbide precipitation.

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