采用Gleeble 1500热模拟试验机研究了新型齿轮钢22CrS在不同变形量下的相变行为及组织、硬度的变化规律.试验结果表明,变形量增大,获得多边形铁素体+珠光体组织的临界冷速增大.定、减径机组工艺为1 000 ℃再加热,900~950 ℃变形,总等效变形40 %时,22CrS齿轮钢管以空冷方式在线地获得多边形铁素体+珠光体组织,硬度为HB187~195.实物质量水平与意大利产齿轮钢管相当,切削性能良好.
参考文献
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