Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Properties and Carbide Morphology of Austenitic Stainless Steel Processed by Controlled Rolling and Accelerated Cooling
Kazuaki MATSUMOTOSeishi TSUYAMAYasuo KOBAYASHIMasaharu HONDA
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1989 Volume 75 Issue 2 Pages 329-336

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Abstract

This paper surveys the application of controlled rolling and accelerated cooling process-(thermomechanical control process=TMCP)-to austenitic stainless steels (AISI304, 304L, 316, 316L). The TMCP makes it possible to produce high-strength stainless steels while retarding carbide precipitation at grain-boundaries. The high strength is achieved by refining microstructures, and the ausforming effect which increases dislocation density. The 10% oxalic acid test reveals that, a sensitized TMCP type 304L does not easily form a ditch structure. The ferric sulfate-sulfuric acid test shows that the corrosion rate relating to chromium depleted zones of the TMCP type 304L is equal to that of the solutionized one. In a sensitized TMCP type 304L, sheet-like M23C6 carbide precipitates dispersively at grain-boundaries and subgrain-boundaries of the un-recrystallized grain. This is very different from the continuous precipitation at grain-boundaries in solutionized stainless steel. It is presumed that the dispersed precipitation leads to a discontinuous chromium-depleted zone and as a result, the sensitized TMCP type 304L does not form a ditch structure.

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