Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Improvement of Hardenability of Steel with Al-B by Double Quenching
Ryuichi HABUMasasuke MIYATASinogu TAMUKAIShozo SEKINO
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1978 Volume 64 Issue 10 Pages 1598-1606

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Abstract

Hardenability increasing effect due to B was studied for low alloy steels treated with Al-B (0.06-0.08% Al-0.0010%). The quench hardenability was found to be markedly improved by double quench. The mechanism of the increased quench hardenability by the double quench was studied by means of a fission track etching technique. It was shown, in the double quench, that a quenching from 1000°C for 1 h prior to the 2nd quench gave rise to excellent hardenability which could not be attained by a single quench. The role of the 1st quench is to obtain the optimum amount of soluble B in matrix. A combination of the Al-B treatment and thet double quench is a reliable method to maximize the hardenability increasing effect of B in low alloy steels.

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