Effect of tempering on the microstructure and mechanical properties of an ultra - high strength steel Q960E

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• 作者：ZHEN FanZHANG KuanQU Jinbo
• 会议时间：2013-06-01
• 关键词：ultra - high strength steel ; Q960E ; quenching and tempering ; TMCP ; tempered martensite embrittlement
• 作者单位：Institute of Research of Iron and Steel ( IRIS ),Jiangsu Shagang Group Co.,Ltd.,Zhangjiagang 215625,China
• 母体文献：第五届宝钢学术年会论文集
• 会议名称：第五届宝钢学术年会
• 会议地点：上海
• 主办单位：中国金属学会
• 语种：chi

摘要

An ultra - high strength steel Q960E,produced by either thermomechanical control process with accelerated cooling plus tempering ( TMCP + AcC + T) or quenching plus tempering ( QT),was investigated with an emphasis on the effect of tempering.The result shows that with the increase of tempering temperature,the yield strength and tensile strength decrease,but the total elongation increases for both the QT and TMCP + AcC + T treated plates.A different response,however,for the impact toughness with regard to tempering was observed.With the increase of tempering temperature,the impact toughness decreases first and then increases,with the lowest values occurring roughly at 400 and 300℃ for the QT and TMCP + AcC + T processes,respectively.The reason for this behavior may be due to the segregation of trace elements to grain boundaries.