CAJ | 학술논문

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(10～120 min)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 ℃, 120 min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(1-31)晶面的夹角为30°.
채용SEM、TEM화XRD등측시방법,연구료일충Ni-Cr-W합금경불동온도(1230～1300 ℃)화불동시간(10～120 min)고용처리후적현미조직.결과표명:경과고용처리후,합금적석출상위부W적면심립방M6C화부Cr면심립방적M23C6.수착고용온도승고화보온시간연장,탄화물체적분수강저.재1270 ℃, 120 min시,대부분적탄화물용해진입기체,련정처적탄화물수선발생용해.M6C여기체불존재임하위향관계,정계상석출적M23C6(220)정면여기체(1-31)정면적협각위30°.
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 (1-31) is 30°.