Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
ISOTHERMAL TRANSFORMATION AND STRUCTURAL CONSTITUENTS AFTER QUENCHING
Hot-Bath Quenching of a Low W-Cr Tool Steel (SKS 2) in Low Temperature Range-I
Itsuro Tatsukawa
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1958 Volume 44 Issue 11 Pages 1279-1283

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Abstract

In order to obtain a fundamental information on an applicability of hot-bath quenching below Ms temperature to an improvement of properties of a 1.0% C-1.0% Cr-1.4% W tool steel, its isothermal transformation and structural constituents after hot bath quenching were investigated by means of microscopic observation, dilatometric and magnetic analysis, as well as hardness test.
The main results obtained are summarized as follows: In hot-bath quenching below the Ms (162°C), there take place, at earlier stage, athermal and isothermal austenite-martensite reactions, and then, at later stage, austenite-lower bainite reaction, which promotes the stabilization of austenite markedly in a similar way as an isothermal reaction in austempering at above the Ms; thus, a mixed structure of tempered martensite and lower bainite containing a lot of retained austenite is obtained by a quenching under certain conditions.

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© The Iron and Steel Institute of Japan
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