ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2018, Vol. 39 ›› Issue (2): 10-12.

• 试验研究 • 上一篇    下一篇

700MPa管线钢热压缩变形及组织研究

杨秀芝1,2,华文林1,杨春杰1,董春法1,肖新华1   

  1. 1湖北理工学院机电学院,黄石435003;
    2华中科技大学材料成形及模具技术国家重点实验室,武汉430074
  • 收稿日期:2017-11-23 出版日期:2018-04-01 发布日期:2022-06-27
  • 作者简介:杨秀芝(1974-),女,博士(2010年华中科技大学),副教授,1997年武汉汽车工业大学(本科)毕业,焊接新材料新工艺,金属丝材工艺等方面的研究。
  • 基金资助:
    华中科技大学材料成形与模具技术国家重点实验室开放课题(No. P2018-014)资助

A Study on Thermal Compression Deformation and Structure of 700 MPa Pipeline Steel

Yang Xiuzhi1,2, Hua Wenlin1,Yang Chunjie1 , Dong Chunfa1, Xiao Xinhua1   

  1. 1 Mechanical and Electrical College, Hubei Polytechnic Institute, Huangshi 435003 ;
    2 State Key Laboratory of Materials Processing and Die & Mould Technology,Huazhong University of Science and Technology, Wuhan 430074
  • Received:2017-11-23 Published:2018-04-01 Online:2022-06-27

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-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0.01~1s-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。

关键词: 700MPa管线钢, 20mm热轧板, 再结晶, 热压缩

Abstract: With using Gleeble-3500 thermal simulator the single pass hot compression deformation and structure evolution of 20 mm hot-rolled plate of 700 MPa pipeline steel (/%: 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) with strain rate 0.01~1s-1 at 850~1250°C have been studied to get single pass real stress-strain curves, hot compression dynamic recrystallization diagram and relation between dynamic recrystallization initial time and deformation temperature (RTT) curves. Research results show that deformation temperature and strain rate make certain of initial recrystallization, the 700 MPa pipe line steel easily occurs dynamic recrystallization with strain rate 0.01~1s-1 at 1100~1250°C.the recrystallization mechanism is hot compression causing the original grain crushing and the new grain boundary migrating to prompt formation of new crystal nucleus.