采用Gleeble-3500模拟试验机、金相显微镜和扫描电镜研究了两种含铬微合金高碳重载车轮钢的连续冷却组织转变规律,分析了冷速对组织及性能的影响。试验结果表明,铬元素含量高的高碳重载车轮钢的临界冷却速度低,淬透性高,珠光体域和珠光体片层间距小,洛氏硬度高;冷速为5.0、8.0、10.0℃/s时有少量的贝氏体和针状铁素体出现,且它们的体积分数随铬含量的增加而增加。 The microstructure and transformation of two kinds of chromium-containing microalloyed high-carbon heavy-duty wheel steel were studied by Gleeble-3500 simulator, optical microscope and scanning electron microscope. The influence of cooling rate on microstructure and properties was analyzed. The results show that the critical cooling rate of high-carbon heavy-duty wheel steel with high content of chromium is low, the hardenability is high, the distance between pearlite and pearlite sheet is small and the Rockwell hardness is high. The cooling rate is 5.0, 8.0, 10.0 ℃ / s when a small amount of bainite and acicular ferrite appear, and their volume fraction increases with the increase of chromium content.