真空水平连铸净化处理JG4246A返回料组织与性能  

Microstructure and Properties of JG4246A Superalloy Revert Purified by Vacuum Horizontal Continuous Casting

作　　者：郝志博 骆合力[1,2] 李尚平 韩少丽 侯杰 韩光炜 Hao Zhibo;Luo Heli;Li Shangping;Han Shaoli;Hou Jie;Han Guangwei(High Temperture Materials Department,Central Iron and Steel Research Institute,Beijing 100081,China;GAONA Aero Materrial Co.,Ltd.,Beijing 100081,China)

机构地区：[1]钢铁研究总院高温材料研究所,北京100081 [2]北京钢研高纳科技股份有限公司,北京100081

出　　处：《稀有金属》2024年第11期1582-1590,共9页Chinese Journal of Rare Metals

基　　金：国家重点研发计划项目(2022YFC3902002);国防科工局军品配套项目资助

摘　　要：铸造高温合金返回料因其夹杂物和有害气体元素含量高导致其不能利用,通过真空水平连铸技术净化处理高Al,Ti含量铸造高温合金JG4246A返回料,使用底铸出钢工艺使充型区远离上浮至熔体顶部夹杂物,制备高洁净返回料母合金棒材,其中O,N,S总含量不高于12×10^(-6),夹杂物含量不高于0.46 mg/10 kg,洁净度达到/超过新料母合金水平。使用JG4246A返回料母合金浇铸力学性能试棒,其组织形貌与相同浇铸工艺新料合金试棒基本相同,室温、600,800和1000℃拉伸强度达808,843,902和539 MPa;800℃/490 MPa和1100℃/60 MPa持久寿命分别达212和104.2 h,不同应力状态下高周疲劳寿命均达到新料水平,其中850℃/461 MPa和850℃/229 MPa高周疲劳寿命成倍于新料中值,高周疲劳断口未发现夹杂物存在。经真空水平连铸技术净化处理后,JG4246A返回料达到了新料水平。With the gradual development of industries such as aerospace,the demand for cast superalloy products is increasing.During the casting process,due to the needs of design,there are often a large number of cast systems,which makes the yield of parts relatively low,often accounting for 40%.If thin-walled parts are cast,the yield will be lower,often accounting for 20%.At the same time,there are cast scrap rates,all above will result in many cast superalloys forming reverts,and the number of reverts is staggering with increasing number of cast superalloy products.This results in a large accumulation of cast superalloy reverts,leading to a massive waste of strategic resources.Non-metallic inclusions and harmful gases are the main obstacles affecting the reuse of cast superalloy returned materials,the existence of inclusions will seriously affect the preparation cost and service performance of cast superalloys,especially the fatigue properties of alloys.The effective removal of the inclusions and reduction of harmful gas content are the main tasks when purifying cast superalloy reverts.According to the alloy composition and the inclusion characteristics of the reverts,the returned materials of casting superalloys are divided into three categories:(1)high Hf content cast superalloy,the inclusions in the reverts are mainly composed of a large amount of high specific gravity HfO2;(2)high Cr content casting superalloy,the N content in the revert is relatively higher,and there are many N-rich inclusions in the reverts;(3)high Al and Ti content casting superalloy,the reverts contain a large amount of low-specific gravity inclusions,such as Al-rich inclusions and Ti-rich inclusions.JG4246A alloy is a cast Ni3Al-based high temperature structural material with Al,Ti,Hf content as high as 10%,it is the representative of high Al and Ti content cast superalloys,and it has been used in batches.Since the alloy castings are all complex thin-walled parts,the preparation is very difficult,and the yield of the castings is low.Those have r

关 键 词：真空水平连铸 返回料 铸造高温合金 JG4246A 净化处理 

分 类 号：TG249.5[机械工程—精密仪器及机械] TG132.3[金属学及工艺—铸造]