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GH3039脉冲激光焊接头组织性能研究刘丰刚,成军,潘海莎,郑刚亮西安理工大学材料科学与工程学院摘 要:采用脉冲激光焊接工艺对GH3039镍基高温合金进行实验研究.焊接工艺参数选择适当时,可以获得较好的焊接接头.试验接头参数为:工作电流240 A,脉宽6 ms,频率14 Hz,焊接速度105 mm/min,离焦量3 mm,气流量3 L/min.通过硬度测定,金相观察,拉伸试验对焊缝组织和形貌进行观察和分析.结果表明,焊缝组织主要为奥氏体基体,中心区域为细小的等轴晶,边缘为柱状晶,焊缝中心的硬度高于母材硬度,焊缝组织中的层状形貌是由脉冲激光间断作用形成.关键词:镍基高温合金;激光焊;焊接接头;显微组织;......
FATIGUE CRACK PROPAGATION OF Ni-BASE SUPERALLOYS L.Z.Ma1,E.Barbero1,X.B.Liu1,K.M.Chang1 (1.Dept. of Mechanical & Aerospace Engineering, West Virginia University, Morgantown,WV 26506-6106, USA) Abstract:Time-dependent Fatigue Crack Propagation (FCP) behaviors of five Ni-base superalloys were investigated at various temperatures under fatigue with various holding times and sustained loading......
PROPERTIES, WELDABILTTY AND APPLICATIONS OF ADVANCED WROUGHT SUPERALLOYS FOR GAS TURBINE ENGINES V.R.Ishwar1,D.L.Klarstrom1,M.D.Rowe1 (1.Haynes International, Inc., Kokomo, Indiana IN 46904-9013... of advanced wrought superalloys for gas turbine applications include high temperature strength, thermal stability, oxidation resistance and fatigue resistance.In this paper, the properties of twelve wrought......
高温合金GH3039表面ZrO2-CeO2/Al2O3复合陶瓷涂层抗热震性能尹春生1,姚正军1,2,方超1,杜文博11. 南京航空航天大学材料科学与技术学院2. 面向苛刻环境的材料制备与防护技术工业和信息化部重点实验室摘 要:基于溶胶-凝胶技术制备Al2O3溶胶及ZrO2和CeO2陶瓷粉末,将ZrO2和CeO2陶瓷粉末掺杂在Al2O3溶胶中形成复合浆料并在高温合金GH3039表面分别制备Al2O3,ZrO2/Al2O3和ZrO2-CeO2/Al2O3复合陶瓷涂层,通过XRD,SEM,EDS,DSC等检测手段研究不同陶瓷粉末的加入对复合陶瓷涂层在900℃抗热震性能的影响.结果表明:未添加任何陶瓷粉末的纯Al2O3陶瓷涂层在烧结过程中会产生大量的宏观裂纹,涂层表面质量差且易剥落;在Al2O3溶胶中掺杂......
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Trans. Nonferrous Met. Soc. China 23(2013) 3257-3264 Effect of carbon and boron additions on segregation behavior of directionally solidified nickel-base superalloys with rhenium Qin HU1,2, Lin LIU1... microstructure were investigated in experimental nickel-base superalloys with different levels of carbon and boron. The results show that the liquidus temperature decreases gradually but the carbide solvus......
INTERMETALLICS AS SUBSTITUTES FOR SUPERALLOYS Z.Y. Zhong1,D.Feng1,J.Zhang1 (1.High Temperature Materials Division, Central Iron and Steel Research Institute, Beijing 100081,China) Abstract:The application advances of TiAl, Ti3Al and Ni3Al base alloys were demonstrated by Central Iron and Steel Research Institute, China. The recent research progresses on improving the reliability of cast TiAl......
RESEARCH ON REFRACTORY SUPERALLOYS IN THE HTM 21 PROJECT Y.Yamabe-Mitarai1,Y.F.Gu1,H.Harada1,C.Huang1 (1.High-Temperature Materials Group, National Institute for Materials Science, Sengen 1-2-1,Tsukuba, Ibaraki 305-0047, Japan) Abstract:It was proposed that a new class of alloys based on platinum group metals (PGMs) were called refractory superalloys.These refractory superalloys have an fcc......
Effect of ultrasonic micro-forging treatment on microstructure and mechanical properties of GH3039 superalloy processed by directed energy depositionQingqing Li1,Yong Zhang1,Jie Chen1,2,Bugao... and improve mechanical properties of GH3039 superalloy cladding layer processed by directed energy deposition(DED). The microstructure, defects and mechanical properties of the cladding layers treated......
Science and Engineering, Tsinghua University摘 要:Nickel-based single-crystal superalloys are the key materials for the manufacturing and development of advanced aeroengines. Rhenium is a crucial alloying element in the advanced nickel-based single-crystal superalloys for its special strengthening effects. The addition of Re could effectively enhance the creep......