研究了100～300℃回火对0.054C-1.18Si-1.16Mn-0.49Cr成分热轧双相钢DP600的显微组织和力学性能的影响.结果表明:回火温度主要影响热轧双相钢中铁索体位错密度和马氏体微观结构;随着回火温度的增加,热轧双相钢中铁素体可动位错密度降低,马氏体部分发生分解,析出碳化物;回火温度对抗拉强度影响不大,对屈服强度和屈强比的影响显著,175℃以上同火,热轧双相钢屈服强度显著提高,并出现屈服平台,150℃以下回火热轧双相钢屈服强度增加不明显,不出现屈服现象.
Effect of tempering temperature in range of 100-300℃on microstructure and mechanical properties of hotrolled DP steel with composition of 0.054C-1.18Si-1.16Mn-0.49Cr was studied.It shows 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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