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采用Gleeble 1500热模拟试验机模拟了ER70S-6钢在高速线材生产中的精轧和冷却工艺,并根据模拟试验结果绘制了ER70S-6钢的动态CCT曲线图,优化了获得双相组织的精轧和冷却工艺。结果表明,在845℃变形后以大于10℃/s冷速冷却,ER70S-6钢可以获得含约11%马氏体的双相组织;冷速大于30℃/s时变形组织的晶粒尺寸较小,约4.2μm。变形后以大于30℃/s的冷速冷却,ER70S-6钢可以获得晶粒尺寸细小、马氏体含量稳定的双相组织。通过热模拟试验的指导,在高速线材轧机上成功生产出晶粒尺寸约8.2μm、马氏体含量约11.5%的双相组织盘条。
The finish rolling and cooling process of ER70S-6 steel in high-speed wire rod production were simulated by Gleeble 1500 thermal simulation machine. Based on the simulation results, the dynamic CCT curve of ER70S-6 steel was simulated, Rolling and cooling process. The results show that the dual-phase structure with about 11% martensite can be obtained in ER70S-6 steel after cooling at 845 ℃ and cooling at more than 10 ℃ / s. When the cooling rate is more than 30 ℃ / s, the grain size of the deformed structure Smaller, about 4.2 μm. After deformation, the cooling rate is more than 30 ℃ / s, the ER70S-6 steel can obtain the dual-phase structure with small grain size and stable martensite content. Through the guidance of the thermal simulation test, the dual-phase wire rod with a grain size of about 8.2μm and a martensite content of about 11.5% was successfully produced on a high-speed wire rod mill.