D0I:10.13374/i.issn1001-053x.1989.06.020 北京科技大学学报 第11卷第6期 Vo1.11No.8 1989年11月 Journal of University of Science and Technology Betjing Nov.1989 The Behavior of Inclusions during the Special Melting Processes of Superalloys' Fu Jie(停杰)**，Zhao Junhua(赵俊华)，Xu Gaoyang（徐高阳) Wang Hu:(王忠)*◆* ABSTRACT:The behavior of nitride inclusions during the VIM,VAR and ESR processes of superalloys has been investigated.The experimental results have proved that the inclusions in the original metals,even if the pure TiN power added rapidly decompose at the superalloy liquid processing temperature and the nitrides in the remelted metals are mainly precipitated from solution during the solidification process. KEY WORDS:superalloy,inclusion,special melting process The type,quantity,morphology,size and distribution of inclusions have an important effect on the properties of superalloys.The oxide and other types of inclusions potentially decrease the low cycle fatigue life of nickle-base superalloys, As a result of the recent investigationt1l,it has been found that the increase of nitrogen content,consequently,the increase of the amount and size of multi- angular MC-type carbide inclusions in GH36 (31481)obviously decrease the reduction of area,impact toughness,stress rupture life and stress rupture elonga- tion of the alloy. To control the clcanliness of superalloys,it is necessary to know the beha- vior of inclusions,first of all,to determine the inclusion state of existing during the special melting processes of superalloys.The state of existing of inclusions determines their removal mechanism,consequently,the technique for removing inclusions.The solid inclusions in the liquid metal can be removed,relying on the appoximate interfacial property of ceramic materials or molten slag adhering Manuscript Received May 1,1989 ·,Dept of Metallurgy ··+Dcpt,of Material Scicace and Engineering 501气 第 卷第 期 年 月 北 京 科 技 大 学 学 报 以 手 。 。 ‘ 傅 杰 专 ， 赵 俊华 不厂 王 惠 徐 高 阳 ， · ， 、 · · 口 ， ， 、 、 ， ， ， 几 一 ， ， ， 一 ， ， 。 ， ， ， 丫 ， ， · ， ， 一 … DOI ：10．13374／j ．issn1001－053x．1989．06．020