稀土低温高碳势渗碳对20CrMnMo钢组织和性能的影响  

EFFECT OF LOW TEMPERATURE AND HIGH CARBON POTENTIAL CARBURIZATION WITH RARE EARTH ELEMENT ON MICROSTRUCTURE AND PROPERTIES OF STEEL 20CrMnMo

作　　者：刘志儒[1] 单永昕[1] 朱法义[1] 崔约贤[1] 王成国 聂众 

机构地区：[1]哈尔滨工业大学 [2]鞍山红旗拖拉机厂

出　　处：《金属热处理学报》1993年第3期45-51,共7页

摘　　要：将稀土的催渗和微合金化、低温渗碳和高碳势渗碳三者相结合的新工艺处理20CrMnMo钢,结果表明:与常规渗碳相比温度降低了50～70℃,在同一低的渗碳温度下渗碳速度提高了30%;过共析区碳化物呈细小颗粒状弥散分布,马氏体呈隐晶或细片状;耐磨性提高30%以上,弯曲疲劳极限提高30%～47%,齿轮台架试验寿命提高26%～80%;节电率20%～30%;齿轮变形减少1/2～1/3。Steel 20CrMnMo has been treated by a new developed carburiza-tion technology which combines the low temperature,high carbon potentialand the catalyzing and micro-alloying of rare earth element.Experimental re-sults indicate that the characterastics of new carburization process are thecarburizing temperature being lowered 50～70℃ than conventional process,andthe carburized rate at same low temperature being increased more than about30%.The fine dispersing particles of carbide are distributed in the hyper-eutectoid range of carburized case and those range the austenite will trans-form to cryptocrystalline martensite or small plate martensite.The propertiesare increased as follows:30% for wear resistance,30%～47% for bending fati-gue limit,26%～28% for contact fatigue of gear.In addition,the electricalpower is saved 20%～30%,and distortion of gear is decreased 1/3～1/2.

关 键 词：稀土渗碳 低温渗碳 高碳势渗碳 

分 类 号：TG161.81[金属学及工艺—热处理]