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用分形分析的方法定量描述了定向凝固高温合金的树枝晶晶界形貌。结果表明，随着凝固速率的提高，晶界分形维数均增大。还讨论了凝固合金系统熵与晶界分形维数之间的关系。

关键词: 高温合金 , fractal , directional solidiflcation , superalloy

GH718合金氢渗透特性的研究

ＧＨ７１８合金氢渗透特性的研究徐坚，孙秀魁，刘清泉，陈文绣（中国科学院金属研究所，快速凝固非平衡合金国家重点实验室沈阳１１００１５）１前言ＧＨ７１８（ＩＮＣＯＮＥＬ７１８）合金广泛用作为涡轮叶片、氢燃发动机、核反应堆器壁等部件的材料．由于使用环境中氢气氛的存在，选材时必须考虑氢的进入与传输对合金性能...

关键词: null , hydrogen diffusion , superalloy , precipitation-phase

拉晶速率对单晶高温合金凝固析出行为及显微组织的影响

程国华 , 赵京晨 , 孙家华 , 史正兴

金属学报

研究了拉晶速率对单晶高温合金凝固界面形态、一次臂间距、（γ＋γ＇）共晶和γ＇相析出行为的影响．结果表明，随拉晶速率的增加，凝固界面从平面向胞状、粗枝、细枝转变，一次臂间距先增加然后减小，（γ＋γ＇）共晶增多，γ＇尺寸减小，立方规则性增加．胞状、枝状凝固时，γ＇尺寸出现“双峰”分布．

关键词: 拉晶速率 , superalloy , single crystal , liquid/solid interface morphology , microstructure

LDZ125微晶涂层抗循环氧化性能

张捷 , 楼翰一

腐蚀学报（英文）

研究了高温合金LDZ125及其溅射微晶涂层的抗循环氧化行为.微晶涂层仅由γ相组成,晶粒尺寸约为30nm.结果表明:微晶涂层在1000℃的抗循环氧化性能比铸态合金的有极大提高.微晶层氧化时只形成单一的Al2O3氧化膜,且在整个氧化过程中未见开裂剥落,有极好的粘附性.

关键词: 溅射 , coating , microcrystal , superalloy , cyclic oxidation

一种新型定向凝固镍基高温合金抗热腐蚀性能的研究

宁礼奎郑志谭毅刘恩泽佟健于永泗王华

金属学报

研究了新型定向凝固镍基高温合金DZ68的抗热腐蚀性能, 并与K438合金进行了比较. 结果表明: 热处理态DZ68合金组织中几乎没有(γ+γ') 共晶, 碳化物尺寸小,其整体组织比较均匀; 在热腐蚀过程中发生比较均匀的腐蚀, 其外腐蚀层的腐蚀产物主要是(Ni, Co)Cr₂O<...

关键词: DZ68 , hot corrosion , superalloy

3种700℃级超超临界燃煤锅炉备选高温合金煤灰腐蚀行为

鲁金涛 , 谷月峰 , 杨珍

腐蚀学报（英文）

研究了3种700℃超超临界燃煤锅炉备选高温合金Inconel 740,CCA617,GH 2984在760℃现役机组煤灰腐蚀介质中的高温腐蚀行为.结果表明:镍基合金Inconel 740和CCA 617均能形成保护性的Cr2O3氧化膜,局部点蚀为其主要失效形式.点蚀区域氧化膜为多层结构,由外到内依次...

关键词: 700℃超超临界 , 高温合金 , 煤灰腐蚀 , 腐蚀机理

CRACK GROWTH BEHAVIOR AND FRACTURE FEATURE OF GH2132 UNDER CREEP-FATIGUE CONDITIONS

M.F. Geng(Luoyang Ship Material Research Institute , Luoyang 471039 , China)

金属学报(英文版)

The crack growth behavior and fracture feature of superalloy GH2132 (equivalent to A286) under creep-fatigue conditions have been studied in the present paper. The tests were carried out at 550℃ under various cyclic freqencies (hold time) and load levels,and the fracture surfaces were examined by us...

关键词: creep-fatigue , null , null , null , null , null

HEAT TRANSFER BEHAVIOR OF SUPERALLOY DROPLETS DURING SPRAY FORMING

J.F. Sun , J. Shen , Z. Y. Li , J. Jia and Q.C. Li National Key Laboratory of Metal Precision Hot Processing , Harbin Institute of Technology , Harbin 150001 , China

金属学报(英文版)

Based on the Newtonian heat transfer formulation and classical heterogeneous nucleation theory, a mathematical model has been established to predict the profile of flight velocity, heat transfer coefficient, temperature, solid fraction and cooling rate of atomizing droplets for a superalloy. The re...

关键词: spray forming , null , null , null

HIGH TEMPERATURE CRACK PROPAGATION AND FRACTUREOF SUPERALLOYS

Author X.S. Xie , Z.C. Xu and J.X. Dong High Temperature Materials Research Laboratory , University of Science and Technology Beijing , Beijing 100083 , ChinaManuscript received 18 October 1998

金属学报(英文版)

High temperature crack propagation and fracture behavior of disks produced by six superalloys have been studied. Crack propagation rates were determined at 650 creep, fatigue and creep/fatigue interaction conditions. The crack propagation rate is raised with increasing strength of superalloy and i...

关键词: crack propagation , null , null , null

SPRAY FORMED NICKEL-BASE SUPERALLOYS

Z. Li , S.F. Tian , X.G. Zhao , Z.K. Liang , L.P. Ren , G.F.Mi and M.G. Yan(Bejing Institute of Aeronautical Materials , Beijing 100095 , China Manuscript received 26 August 1996)

金属学报(英文版)

In this paper,part of the research and development work in the field of spray formed superalloys at BIAM of China is briefly summarized. With an experimental spray forming facility,whose melting capacity is suitable for making disk and columnar shaped integral-dense and clean Ni-base superalloy pref...

关键词: :spray forming , null , null

材料期刊网

定向凝固高温合金晶界形貌的分形描述

GH718合金氢渗透特性的研究

拉晶速率对单晶高温合金凝固析出行为及显微组织的影响

LDZ125微晶涂层抗循环氧化性能

一种新型定向凝固镍基高温合金抗热腐蚀性能的研究

3种700℃级超超临界燃煤锅炉备选高温合金煤灰腐蚀行为

CRACK GROWTH BEHAVIOR AND FRACTURE FEATURE OF GH2132 UNDER CREEP-FATIGUE CONDITIONS

HEAT TRANSFER BEHAVIOR OF SUPERALLOY DROPLETS DURING SPRAY FORMING

HIGH TEMPERATURE CRACK PROPAGATION AND FRACTUREOF SUPERALLOYS

SPRAY FORMED NICKEL-BASE SUPERALLOYS

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