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| THE EFFECT OF BORON AS A FUNCTION OF AUSTENITISING TEMPERATURE |
| LEE LING;YU SHOU-LU;CHEN CHUNG-LIAN Institute of Metallurgy and Ceramics; Academia Sinica Chao Tung University; Department of Mechanical Engineering |
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Cite this article:
LEE LING;YU SHOU-LU;CHEN CHUNG-LIAN Institute of Metallurgy and Ceramics; Academia Sinica Chao Tung University; Department of Mechanical Engineering. THE EFFECT OF BORON AS A FUNCTION OF AUSTENITISING TEMPERATURE. Acta Metall Sin, 1957, 2(1): 75-88.
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Abstract The influence of austenitising temperature upon hardenability was determinedfor two boron-treated steels; and it was shown that under different conditions ofheat treatment, the hardenability of boron steel decreases with increasing tempera-ture. The presence of oxygen and nitrogen has an appreciable effect in decreasingthe hardenability of boron steels, but the distribution of free boron atoms in aus-tenite has a more profound effect on hardenability. Investigations on the formation of boron constituent in boronised specimensshowed that by direct quenching from high austenitising temperatures, the boronprecipitate was distributed uniformly both at the austenite grain boundaries andwithin the grains. While in the isothermally treated, normalised, or slowly cooledspecimens, the boron constituent mainly ptecipitated at the austenite grain boundaries.Thus it was proposed that the loss of hardenablility of boron steels at high auste-nitising temperatures was probably due to the desorption of boron atoms from thevicinity of the austenite grain boundaries; consequently there will not be enoughboron atoms to lower the grain boundary energy and the boron hardenabilityeffect was temperarily lost.
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Received: 18 January 1957
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