作者:杨秀芝; 华文林; 杨春杰; 董春法; 肖新华700mpa管线钢20mm热轧板再结晶热压缩
摘要:利用Gleeble-3500型热模拟机,研究700MPa管线钢(/%:0.07C,0.90Si,0.60Mn,0.008P,0.002S,0.30Ni,0.10Cr,0.12Mo,0.06V,0.03Nb,0.28Cu,0.04Alt,0.0060N)20mm热轧板在850~1250℃和应变速率0.01—1s^-1下单道次热压缩变形及组织演变,得出单道次压缩变形真应力一真应变曲线,热压缩再结晶动态图和动态再结晶开始时间与变形温度关系(RTT)曲线。研究结果表明,发生再结晶由变形温度和应变速率共同决定,该700MPa管线钢在温度1100~1250℃和应变速率0.01~0.1s^-1下压缩变形时容易发生再结晶。再结晶发生机制是热压缩应变,使得原始晶粒破碎、新晶界产生迁移促使新晶核生成。
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