φ530 mm Inconel 625合金铸锭组织及其在加热过程的变化  

Structure of the φ530 mm as-cast ingot of Inconel 625 alloy and its transformation during heating

作　　者：刘爽 朱玉亮[2] 郑文杰[2] 宋志刚[2] 丰涵[2] Liu Shuang;Zhu Yuliang;Zheng Wenjie;Song Zhigang;Feng Han(Faeuhy of Materials Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;Institute for Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院特殊钢研究所,北京100081

出　　处：《金属热处理》2018年第11期53-57,共5页Heat Treatment of Metals

摘　　要：研究了φ530 mm Inconel 625合金铸锭的组织及其在加热过程中的组织转变。结果表明,除了基体相外,铸态合金由于凝固偏析还会依次形成NbC、Laves、δ-Ni3Nb以及γ″等第二相。其中δ-Ni3Nb以及γ″相经1100℃固溶就能完全溶入基体中,Laves相在1140℃开始溶入基体。在1185℃时,Inconel 625合金发生初熔,为了提高合金的均匀性,合金合适的扩散退火应为1180℃。Microstructure of the φ530 mm as-cast ingot of Inconel 625 alloy,as well as its transformation during heating,were investigated by means of a series of experiments. The results show that except for the base austenitic phase,the secondary phases such as NbC,Laves,δ-Ni3Nb and γ″ appear as a result of the solidification segregation. The δ-Ni3Nb and γ″ phases can be fully solid soluted in the base phase,while the Laves phase begins to solute at the temperature of 1140 ℃. The initial melting occurs at 1185 ℃,in order to improve the homogeneity of the alloy,the recommended homogenizing temperature is 1180 ℃.

关 键 词：INCONEL 625 凝固偏析 铸态组织 Laves NBC 均匀化处理 

分 类 号：TG156.1[金属学及工艺—热处理]