摘要
采用Gleeble-3500热模拟试验机研究了cu—P-cr-Ni-Mo耐候钢在变形温度700～950℃、变形量70％、应变速率0．01～10s“条件下的热变形行为及其热变形的组织演变规律。结果表明，Cu-P—Cr—Ni—Mo耐候钢在700—950℃变形时，峰值应力在低于750℃，高于850℃时随变形温度的升高而降低，而在750～850℃之间随温度升高先降低后升高，在800℃出现极小值。在应变速率和变形量不变的情况下，随着变形温度的降低，组织的细化机制由奥氏体的再结晶细化向铁素体的回复再结晶细化转化，并且铁素体的回复再结晶细化效果更加显著。Cu-P·Cr-Ni—Mo耐候钢在应变速率为1s-1，变形量为70％的变形条件下，变形温度为775℃时获得的组织细小均匀，铁素体晶粒的平均尺寸约为3μm。
Hot deformation behavior in the intercritical region of Cu-P-Cr-Ni-Mo weathering steel was investigated by using Gleeble 3500 simulator at the 700 -950 ℃ and strain rates of 0.01 - 10 s-1. The results show that while the deformation temperatare is below 750 ℃ and above 850 ℃ , the peak stress decreases with the temperature increasing; but at the range of 750 -850 ℃ , the peak stress decreases with the temperature increasing at first, and then reaches a minimum stress at 800 ℃, finally, the peak stress increases with the temperature rising. In the case of the same strain rate and same reduction, with the deformation temperature decreasing, the mechanism of microstructure refinement is changed from austenite recrystallization to ferrite recovering and recrystallizaion, and the effect of refined ferrite recrystallization is more significant. The fine ferrite grain of 3 μm of weathering steel Cu-P-Cr-Ni-Mo can be obtained by deforming at 775 ℃ with strain rate 1 s-1and the reduction 70%.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第2期69-74,共6页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51104130)
河北省自然科学基金(E2012203137)
关键词
耐候钢
热变形
组织
再结晶
细化
weathering steel
hot deformation
microstructure
recrystallization
refinement
