摘要
用Thermecmastor-Z型热模拟机模拟试验了成分(%)为:0.03C-1.05Mn-0.6Cr-0.08Nb的Nb超低碳钢加热1 200 ℃后冷至850 ℃压缩变形50%,并在850 ℃下保温20～1 000 s后快冷至450 ℃,再空冷的过程中的组织演变.试验结果表明,随50%变形后保温时间的延长,钢中针状铁素体及贝氏体数量减少,多边铁素体数量增加,马氏体-奥氏体(M-A)岛尺寸增大,组织中位错密度降低;当50%变形后,保温时间＞50 s时,显微硬度(Hv10)值快速下降,保温时间≥500 s时,Hv10值下降较慢.
The structure evolution of a Nb-mieroalloyed extra-low carbon steel 0.03C-1.05Mn-0.6Cr-0.08Nb during 1200℃ heating, then cooling to 850℃ and reducing 50%, holding at 850℃ for 20 ～ 1000 s fast cooling to 450℃, air cooling has been simulated and tested by Thermecmastor -Z thermal simulator. The test results showed that with increasing holding time after reduction 50%, the amount of acicular ferrite and bainite in steel and the dislocation density in structure decreased, where the size of martensite-austenite （M-A） island increased; As the holding time after reduction 50% was more than 50s, the micro hardness （Hv10） value quick decreased but that more than 500s the Hv10 hardness value decreased slowly.
出处
《特殊钢》
北大核心
2005年第6期38-40,共3页
Special Steel
