摘要
通过Gleeble-1500热模拟试验机测定了X80管线钢(%:0.05C、0.17Si、1.78Mn、0.40Mo、0.08Nb、0.03V、0.03Ti)18 mm板经1100℃,1 s^(-1),40%变形,再以5℃/s冷至850℃,1 s^(-1),40%变形,并以1～40℃/s冷却至室温后的连续冷却转变(CCT)曲线,同时研究了冷却速度对组织和HV硬度的影响。结果表明,随冷却速度提高晶粒细化,针状铁素体比例增加,同时HV硬度提高。为得到较佳的组织,热变形后钢的冷却速度应≥15℃/s。
The continuous cooling transformation （CCT） curves of 18 mm plate of X80 pipeline steel （ % ： 0.05C, 0. 17Si, 1.78Mn, 0. 40Mo, 0. 08Nb, 0. 03V, 0. 03Ti） with 1 s -1 and 40% deforming at 1 100 ℃, then 5 ℃/s cooling to 850 ℃ , 1 s-1 and 40% deforming and 1 -40 ℃/s cooling to ambient temperature were determined by Gleeble-1500 ther- mo-simulition machine and the effect of cooling rate on structure and HV hardness of steel was studied. Results show that with increasing cooling rate, the grains fine, the proportion of acicular ferrite in structure increases and the HV hardness of structure also increases. In order to get better structure, the cooling rate of hot-deformed steel should be ≥ 15 ℃/s.
出处
《特殊钢》
北大核心
2010年第1期63-65,共3页
Special Steel
关键词
X80管线钢
CCT曲线
热变形
冷却速度
组织
硬度
X80 Pipeline Steel, CCT Curves, Hot-Deforming, Cooling Rate, Structure, Hardness
