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| Effects of boron on hardenability and mechanical properties of 60 mm Q690D steel |
| YANG Wei-yu1，DONG Rui-feng2， GAO Feng1，LI Zhi-li1 |
（1. Technical Center， Steel Union Co.， Ltd.， Baotou Steel Group Corporation， Baotou 014010， Nei Mongol， China
2. School of Materials Science and Engineering， Inner Mongolia University of Technology， Hohhot 010051， Nei Mongol， China） |
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Abstract By jominy test， [Z] direction hardness test， microstructure and mechanical properties analysis，the effects of boron on hardenability and mechanical properties of 60 mm Q690D steel were studied. The results show that the trace solution boron can significantly improve the hardenability of 60 mm Q690D steel; compared with the experimental steel without boron addition，quenching microstructure of experimental steel with boron addition was transformed from martensite/bainite complex phases to lath martensite at thickness of 1/4， the maximum hardness difference of [Z] direction at transverse section for quenching was reduced from 9HRC to 4HRC and that for tempering was reduced from 5HRC to 3HRC， which made the homogeneity of hardness at [Z] direction improved， as well as the strength and toughness for quenching and tempering of experimental steel with boron.
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Received: 06 June 2014
Published: 02 February 2015
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2015, Vol. 50 
