一种高耐磨合金钢CCT曲线的测定与分析

Measurement and analysis of CCT curve for a high wear resistant alloy steel

通过Gleeble热模拟机测定热轧圆钢以不同速度连续冷却到室温的膨胀曲线,结合金相组织和硬度试验,绘制出一种高耐磨合金钢的CCT曲线,并分析不同冷速对组织演变的影响。结果表明:当冷速在0.05~0.1℃/s时,转变产物为铁素体+珠光体;当冷速为0.15℃/s时,转变产物为铁素体+珠光体+少量的贝氏体组织;当冷速为0.2~0.35℃/s时,转变产物为铁素体+珠光体+贝氏体+马氏体;当冷速为0.5~1.5℃/s时,转变产物为贝氏体+少量的马氏体;当冷速大于2℃/s时,转变产物全为马氏体。

The expansion curve of hot⁃rolled round steel in continuous cooling process to room temperature at different rates was measured using Gleeble thermal simulator.By combining with metallographic structure and hardness test,the continu⁃ous cooling transformation(CCT)curve for a high wear resistant alloy steel was drawn to analyze the effect of different cool⁃ing rates on the microstructure evolution.The results showed that the transformation products were ferrite+pearlite at the cooling rate of 0.05-0.1℃/s.When the cooling rate was 0.15℃/s,the transformation products were ferrite+pearlite+a small amount of bainite.When the cooling rate was 0.2-0.35℃/s,the transformation products were ferrite+pearlite+bainite+martensite.When the cooling rate was 0.5-1.5℃/s,the transformation products were bainite+a small a⁃mount of martensite.When the cooling rate was greater than 2℃/s,the transformation products were all martensite.