固溶处理对Ni-Cr-W合金碳化物的影响(英文)  

Effects of Solution Heat Treatment on Carbide of Ni-Cr-W Superalloy

作　　者：唐增武[1,2] 李金山[1] 胡锐[1] 刘毅[1] 柏广海[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]北京星航机电设备厂,北京100074

出　　处：《稀有金属材料与工程》2010年第7期1157-1161,共5页Rare Metal Materials and Engineering

基　　金：Program of New Century Excellent Talents in University (08GE1213);"973" Project of China (2007CB607603)

摘　　要：采用SEM、TEM和XRD等测试方法,研究了一种Ni-Cr-W合金经不同温度(1230～1300℃)和不同时间(10～120min)固溶处理后的显微组织。结果表明:经过固溶处理后,合金的析出相为富W的面心立方M6C和富Cr面心立方的M23C6。随着固溶温度升高和保温时间延长,碳化物体积分数降低。在1270℃,120min时,大部分的碳化物溶解进入基体,孪晶处的碳化物首先发生溶解。M6C与基体不存在任何位向关系,晶界上析出的M23C6(220)晶面与基体(131)晶面的夹角为30°。The microstructure features of a kind of Ni-Cr-W superalloy after solution heat treatment at different temperatures （1230-1300 °C） for various time （10-120 min） were investigated by means of scanning electron microscope （SEM）,transmission electron microscopy （TEM） and X-ray diffraction （XRD）. The results show that the precipitated phases of the alloy after solution heat treatment are identified as W-rich fcc M6C and Cr-rich fcc M23C6 carbides. The volume fraction of carbides decreases with increasing of the solution heat treatment temperature and time. At the temperature above 1270 °C for 120 min,most of carbides are dissolved into the Ni-matrix,and the carbides distributing at twin boundaries may be dissolved into the matrix first. M6C carbide has no any fixed orientation relationship with the Ni-matrix,but the angle of M23C6 （220） to the matrix （131） is 30°.

关 键 词：Ni-Cr-W合金 固溶处理 显微组织 碳化物 

分 类 号：TG156.94[金属学及工艺—热处理]