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| Research on Effect of Tempering Temperature on Microstructure and Mechanical Property of Hot-Rolled DP Steel |
| xue-wen Hu Le-Yu ZHOU Ya-zheng Liu yi zhang |
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Abstract Effect of tempering temperature in range of 100~300℃ on microstructure and mechanical properties of hot-rolled DP steel with composition of 0.054C-1.18Si-1.16Mn-0.49Cr was studied. It is shown that, tempering temperature has effect on dislocation intensity of ferrite and microstructure of martensite. Dislocation intensity of ferrite decreases with increasing of tempering temperature, meanwhile, martensite tempers and precipitates carbide. Tempering temperature has weak effect on tensile strength of DP steel, but markedly affects the yielding strength and YS/TS ratio. When tempering temperature is over 175℃, yielding strength of DP steel increases and yielding phenomena appears. When tempering temperature is lower than 150℃, yielding strength of DP steel increases appreciably and there is no yield point elongation.
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Received: 15 April 2009
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2010, Vol. 45 
