固溶处理对CoCrW合金组织及耐磨性能的影响  

EFFECTS OF SOLUTION TREATMENT ON MICROSTRUCTURE AND WEAR-RESISTANT PROPERTIES OF CoCrW ALLOYS

作　　者：何波[1] 聂庆武 张洪宇[2] 韦华[2] 

机构地区：[1]沈阳航空航天大学机电工程学院,沈阳110136 [2]中国科学院金属研究所,沈阳110016

出　　处：《金属学报》2016年第4期484-490,共7页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目51201161;辽宁省自然科学基金项目2013024011资助~~

摘　　要：以铸造CoCrW合金为研究对象,通过XRD,SEM和EDS分析以及硬度测试和室温耐磨实验,研究了不同温度的固溶处理对该合金的组织及耐磨性能的影响.结果表明,铸态和固溶态CoCrW合金组织均由M23C6,M6C和γ-Co基体3种相组成,但固溶后合金中碳化物的大小、形貌及分布发生明显变化.固溶后合金中起强化作用的碳化物大量溶解,使合金硬度和耐磨性能降低;随着固溶温度的升高,部分碳化物中的Cr,W等合金元素大量固溶到基体中,提高了基体的强度,使合金的硬度和耐磨性能有所提高;铸态和固溶态CoCrW合金的磨损机制均为磨粒磨损、黏着磨损和氧化磨损的共同作用.Co Cr W alloy is a kind of stellite alloy, which has high strength, good wear resistance, and is widely used in aviation industry, nuclear industry and other fields. For a long time, the Co Cr W alloy is mainly used as coating to have an effect on wear and the corrosion resistance. With the development of the industry, the conventional cast Co Cr W alloy has been widely studied. The mechanical properties of the cast Co Cr W alloy can be changed by heat treatment, which is of high hardness and great brittleness. In this work, hardness and wearresistant properties of the Co Cr W alloys as- cast and after solution treatment were studied by combining XRD,SEM, EDS, hardness test and wear resistance test, and effects of the solution temperature on the microstructure and wear-resistant properties were also investigated. The results showed that the microstructures of the Co Cr W alloys as-cast and after solution treatment were both composed of M_（23）C_6, M_6 C and g-Co matrix, but the size, morphology and distribution of carbides occurred in the alloy changed obviously by solution treatment. The dissolution of a large amount of carbides in the alloy after solution treatment was mainly responsible for the decrease in hardness and wear resistance of the alloy compared with that of the as-cast one. With the increase of the solution temperature, the Cr, W and other alloying elements in the carbides were dissolved into the g-Co matrix so as to strengthen the matrix resulting in the improvement of the hardness and the associated wear resistance of the alloy. The mecha-nism that controlling the wear-resistant property of CoCrW alloys as-cast and after solution treatment was the interaction of abrasive wear, adhesive wear and oxidation wear.

关 键 词：CoCrW合金 固溶处理 硬度 耐磨性能 

分 类 号：TG245[金属学及工艺—铸造]