Author X.A. Zhang1)
,
H.Q. Xia1)
,
Z.T. Wu1)
,
Y.F. Han1)
,
R. Shi2) and G.X. Hu2) \= 1) Mechanical Properties Laboratory
,
Beijing Institute of Aeronautical Materials
,
Beijing 100095
,
China2) The State Education Commission Open Research Laboratory for High Temperature
金属学报(英文版)
Materials and Testing, Shanghai Jiao Tong University, Shanghai 200030, ChinaManuscript received 18 October 1998 The threestage creep behavior of DD3 single crystal superalloy had been studied. The results show that the creeprupture properties of DD3 single crystal satisfy the requirements for high performance turbine blade application. The influence of crystal orientation on the creeprupture property of DD3 single crystal was tested and discussed. An engineering criterion to evaluate the regimes of secondary and tertiary creep is proposed, and this method gives a reasonable result for practical applications. The fractography and TEM micrography of the tested specimens had been studied, and it is determined that the glidecontrolled creep is the basic creep mechanism of DD3 single crystal at intermediate temperature, but the thermally activated processes become dominant at higher temperature.
关键词:
threestage creep curve
,
null
,
null
,
null
高斯峰
,
刘林
,
张军
,
肖俊峰
,
张炯
材料科学与工程学报
doi:10.14136/j.cnki.issn 1673-2812.2015.06.005
采用选晶法在改进型Bridgman定向凝固炉中制备镍基单晶高温合金DD403,利用电子探针(EPMA)技术研究了DD403合金在枝晶生长条件下的显微偏析.结果表明,随着抽拉速率增加DD403的偏析程度逐渐加剧.偏析于枝晶间元素Al、Ti和枝晶干元素Co、W的偏析程度随着抽拉速率的增加而增大,而合金元素Mo和Cr的偏析比接近于1,基本不存在偏析,且偏析比随抽拉速率增加没有明显变化.研究结果同时表明,随着抽拉速率增加DD403的共晶含量逐渐增加.
关键词:
镍基单晶高温合金
,
定向凝固
,
显微偏析
,
共晶
Author C.D. Zhou1
,
2)
,
J.X. Yu1)
,
X.P. Dong1)
,
Y.H. Zhang1)
,
C.Q. Sun3) and T.F. Li4) 1) The State Education Commission Open Research Laboratory for High Temperature Materials and Testing
,
Shanghai Jiao Tong University
,
Shanghai 200030
,
China2) Shanghai Enhanced Lab of Ferrometallurgy
,
Shanghai University
,
Shanghai 200072
,
China3) Institute of Aeronautical Materials
,
Beijing 100095
,
China 4) Institute of Corrosion and Protection of Metals
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
ChinaManuscript received 18 October 1998
金属学报(英文版)
An investigation has been made on the tensile fracture behavior of oriented single crystal DD100 superalloy at 850. The appearance of the fracture surface of DD100 reflects the glide plane decohension fracture mechanism, which is different from the fracture of oriented DD100. The tensile strength and elongation are lower than the oriented DD100. Oxygen in air has little effect on the strength of DD100 but reduces the tensile elongation obviously. Oxygen does not affect the fracture mode of DD100 but strongly accelerates the process of fracture.
关键词:
single crystal superalloy
,
null
,
null
张明军
,
骆宇时
,
肖程波
,
唐定中
,
吴仲棠
材料工程
doi:10.3969/j.issn.1001-4381.2010.11.003
采用不同的抽拉工艺制备DD6单晶合金,分析了DD6单晶合金的显微组织,研究了不同抽拉工艺对DD6合金组织的影响.结果表明,随着抽拉速率的降低,DD6合金一次枝晶间距增加,枝晶干和枝晶间γ′相尺寸变大,共晶组织呈粗化趋势,γ-γ′共晶组织含量减少,合金中主要元素偏析程度减轻.
关键词:
单晶高温合金
,
抽拉速率
,
组织
李嘉荣
,
史振学
,
袁海龙
,
刘世忠
,
赵金乾
,
韩梅
,
刘维维
材料工程
doi:10.3969/j.issn.1001-4381.2008.12.002
研究了[001],[011],[111]取向第二代单晶高温合金DD6的拉伸性能与断口组织.结果表明:DD6单晶高温合金存在拉伸各向异性,850℃以上[001]取向DD6单晶高温合金的抗拉强度与屈服强度分别高于[011],[111]取向合金的强度,[001],[011],[111]取向DD6单晶高温合金的拉伸断口具有类解理断裂与韧窝断裂的特征.
关键词:
单晶高温合金
,
DD6
,
拉伸性能
,
各向异性
张特
,
尚丽娟
,
胡南昌
,
田素贵
材料工程
doi:10.3969/j.issn.1001-4381.2010.z1.047
基于金属高温蠕变理论,结合单晶镍基高温合金蠕变过程的微观特点,从蠕变曲线方程的选择、截断应变点的确定以及强化项和弱化项的影响等方面,对采用修正θ函数影射法提高DD3单晶镍基高温合金蠕变寿命预测精度的原因进行了研究.结果表明:θ函数及其修正式将蠕变视为应变强化和应变弱化过程的综合,符合单晶镍基高温合金蠕变过程的实质,从根本上保证了预测的精度；修正的θ函数比早期的θ函数减少一个待定参数,统一了截断应变的确定方法,不仅减少了计算量,而且降低了因参数确定所产生的误差对蠕变寿命预测精度的影响；采用修正的θ影射方法可以很好地描述DD3合金整个蠕变过程,其预测结果完全能够满足实际工程设计的需要.
关键词:
单晶镍基高温合金
,
蠕变
,
寿命预测
,
修正θ函数影射法
唐定中
,
李嘉荣
,
吴仲棠
,
刘世中
,
吴学仁
材料工程
doi:10.3969/j.issn.1001-4381.1999.03.002
介绍了低成本的第二代单晶合金DD398,该合金综合性能优良,其100h持久强度的承温能力比第一代单晶合金DD3提高30℃,而拉伸性能、持久性能、抗氧化和抗热腐蚀性能达到了国外广泛应用的第二代单晶合金的性能水平.DD398合金组织稳定,单晶工艺性能良好,且具有低成本的优势.
关键词:
单晶高温合金
,
力学性能
,
环境性能
,
铼
