保温时间对Zn脆化镍基单晶高温合金中组织演变的影响  

Microstructure Evolution in Zn Embrittlement Nickel-Based Single Crystal Superalloys with Different Holding Time

作　　者：袁彩霞 李瑞宾 孙元[3] 张金汉 卜宪航 陈振斌[1,2] Yuan Caixia;Li Ruibin;Sun Yuan;Zhang Jinhan;Bu Xianhang;Chen Zhenbin(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Lanzhou University of Science and Technology,Lanzhou 730050,China;Institute of Metals,Chinese Academy of Sciences,Shenyang 110000,China;Gansu Institute of Commerce and Technology Co.,Ltd.,Lanzhou 730010,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [3]中国科学院金属研究所,辽宁沈阳110000 [4]甘肃省商业科技研究所有限公司,甘肃兰州730010

出　　处：《稀有金属》2024年第11期1529-1542,共14页Chinese Journal of Rare Metals

基　　金：甘肃省科技计划中小企业创新基金项目(22CX3JA001);甘肃省自然科学基金重点项目(22JR5RA227);国家重点实验室联合基金项目(18LHZD003,18LHPY004)资助

摘　　要：以镍基单晶高温合金(DD5)磨削废料为研究对象,选择反应温度为900℃,采用真空封管技术研究了不同保温时间对Zn脆化镍基单晶高温合金中组织演变的影响。通过扫描电子显微镜(SEM)、X射线衍射(XRD)和电子探针微区(EPMA)等手段分析反应后试样的微观组织、相组成和元素分布,明确其组织演变过程。结果表明,随着反应时间的延长,Zn脆化镍基单晶高温合金最终产物主要为Ni_(5)Zn_(21)金属间化合物。高温合金经Zn脆化后,体系中W,Re和Ta富集形成了WRe_(x)Ta_(y)固溶体或无定型化合物,Ni,Al和Co以及Ni,Co和Cr在较短反应时间时分别形成NiAl_(x)Co_(y)和NiCoCr金属间合金,但当反应时间足够长时,NiAl_(x)Co_(y)显著减少并逐渐消失,而NiCoCr逐渐转变为CoCr。Superalloys are primarilyused for aerospace petrochemical nuclear industry shipbuilding,because of their excellentcorrosion resistivity and mechanical strength.The extensive use of superalloys has accumulated more and more scraps.However,the recovery technology of superalloys craps in China is immature a large number of superalloy scraps are not fully utilized,resulting in huge resource waste and environmental pollution.Therefore,it is urgent to developenergy saving environment-friendly and efficient recovery technology of superalloy scraps to alleviate the crisis of metal mineral resources energy and environment.Thus,the composition of superalloys is becoming increasingly complicated.However,the growing market demand is driving an ever-increasing necessity for Ni-based superalloys for jet and turbine engines.The widespread application of Ni-based superalloys has led to the generation of large quantities of scrap containing both processing scrap and waste products.At present,there is no method for appropriately reusing superalloy scraps,which mostly accumulate or are sold with foundational components.Therefore,it is necessary to develop a simple method for recovering precious metals from superalloy scrap.Although superalloys can be dissolved by chemical and electrochemical methods,the very small contact area of block superalloy scrap and the formation of a dense passivation film results in an extremely low dissolution efficiency.This in turn makes the dissolution of the blocksuperalloy scrap an extremely time and energy-consuming process.Breaking down superalloy scrap into small pieces is one of the simplest,and most efficient ways to increase the contact surface area.However,the high strength and toughness of superalloy scrap make crushing difficult.The first challenge is therefore superalloy embrittlement.Compared with superalloy dissolution,there has been a lack of research on embrittlement.Therefore,it is necessary to systematically study the impact of environmental changes on the embrittlement process and mi

关 键 词：镍基单晶高温合金 组织演变 保温时间 Zn脆化 元素分布 

分 类 号：TF803.21[冶金工程—有色金属冶金]