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| THE EFFECT OF BORON ON THE NUCLEATION AND GROWTH OF PEARLITE |
| LEE LING;CHI MIN-WEI;CHUNG CHING-CHI;MEO YONG-TZE Institute of Metallurgy and Ceramics; Academia Sinica Nanking Unioersity; Department of Pkysics |
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Cite this article:
LEE LING;CHI MIN-WEI;CHUNG CHING-CHI;MEO YONG-TZE Institute of Metallurgy and Ceramics; Academia Sinica Nanking Unioersity; Department of Pkysics. THE EFFECT OF BORON ON THE NUCLEATION AND GROWTH OF PEARLITE. Acta Metall Sin, 1957, 2(1): 65-74.
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Abstract It was found in this investigation that boron exerted considerable influenceon the nucleation and growth of pearlite. In a hypoeutectoid steel, boron delayedthe starting time of pearlite formation at the maximum pearlite formation temp-erature. Boron did not effect the relation of nucleation rate with time butonly increased the incubation period for pearlite nucleation. In the eutectoidsteel, boron similarily delayed the starting time for the maximum pearlite formationtemperature, but did not effect the nucleation rate with time. It was postulatedthat the austenite grain boundary energy was probably lowered by boron atomsand that there were not enough energy for the formation of pearlite nucleusand thus increased the austenite stability. It was found by experiments thatboron increased the growth rate of pearlite, both in hypoeutectoid and eutectoidsteels. The authors proposed that within the temperatures range of pearlite formation,the reason why boron delayed the beginning of austenite transformation and notthe end of transformation was due to the increased rate of pearlite growth.
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Received: 18 January 1957
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