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Stress-Induced Precipitation of Fineγ'-Phase and Thermodynamics Analysis

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Journal of Materials Science & Technology 2001年第2期17卷 257-259页

作者： sugui tian Department of Materials Science and Engineering, Shenyang Polytechnic University, Shenyang 110023, China Jinghua ZHANG, Yongbo XU and Zhuangqi HU State Key Laboratory for Fatigue and Fracture of Materials, Institute of Metal Research, Chinese Dept. of Mat. Sci. Shenyang Polytechnic Univ. Shenyang 110023 China

The microstructures of a single crystal Ni-base superalloy with [001] orientation were observed by means of TEM. Results showed that the fine γ' particles were precipitated in the γ matrix channels during the tensile deformation of the alloy. Thermodynamics analysis indicated that the solubility of elements M(Al,Ta) within the γ matrix may be changed when the alloy was deformed by the external applied stress. The tensile stress reduced the solubility of elements Al and Ta so as to occur the over-saturation and agglomeration of them, which promoted the precipitation of fine γ'-phase in the γ matrix.

关键词： In Phase and Thermodynamics Analysis Stress-Induced Precipitation of Fine Ta

FGH95粉末镍基合金组织结构对蠕变机制的影响

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稀有金属材料与工程 2013年第2期42卷 325-330页

作者：谢君田素贵周晓明沈阳工业大学辽宁沈阳110870 北京航空材料研究院北京100095

通过对热等静压态FGH95合金进行完全热处理、组织形貌观察、点阵常数测定和蠕变曲线测定,研究了FGH95镍基合金的组织结构和蠕变机制。结果表明:合金经热等静压成型后,粗大相沿原始颗粒边界不连续分布,经高温固溶和时效处理后,晶粒尺寸... 详细信息

通过对热等静压态FGH95合金进行完全热处理、组织形貌观察、点阵常数测定和蠕变曲线测定,研究了FGH95镍基合金的组织结构和蠕变机制。结果表明:合金经热等静压成型后,粗大相沿原始颗粒边界不连续分布,经高温固溶和时效处理后,晶粒尺寸无明显变化,粗大相数量减少,且细小相和MC碳化物在合金中弥散析出,可提高合金蠕变抗力,同时由于相形成元素Al、Ti溶入基体,经XRD谱线测定,相的平均点阵常数减小,而基体相平均点阵常数增加,致使/两相晶格错配度减小;在实验温度和应力范围内,测得合金的蠕变激活能为630.4kJ/mol。在蠕变期间,FGH95合金的蠕变机制是位错在基体中运动或剪切相,其中,蠕变位错以Orowan机制绕过相,而超位错切过相发生分解形成(1/3)超肖可莱不全位错+层错的位错组态。

关键词： FGH95镍基合金组织结构点阵常数蠕变变形机制

单晶镍基合金在拉伸蠕变期间的组织演化与分析

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稀有金属材料与工程 2012年第1期41卷 28-32页

作者：张姝田素贵钱本江苏勇沈阳工业大学辽宁沈阳110870 沈阳化工大学辽宁沈阳110142

通过[001]取向镍基单晶合金拉伸蠕变期间的组织形貌观察,采用应力应变有限元方法计算出立方γ/γ′两相共格界面的vonMises应力分布,研究了合金在蠕变期间γ′相的定向粗化规律。结果表明,施加拉应力可改变立方γ/γ′两相的应力分布,... 详细信息

通过[001]取向镍基单晶合金拉伸蠕变期间的组织形貌观察,采用应力应变有限元方法计算出立方γ/γ′两相共格界面的vonMises应力分布,研究了合金在蠕变期间γ′相的定向粗化规律。结果表明,施加拉应力可改变立方γ/γ′两相的应力分布,使不同晶面发生晶格收缩与扩张应变,其中,(001)晶面产生晶格收缩可排斥较大半径的Al、Ti原子,(100)和(010)晶面沿平行于应力轴方向产生晶格扩张应变,可诱捕较大半径的Al、Ti原子,是使其γ′相沿扩张晶格的法线定向生长成为类似筛网层状结构的组织演化规律。并进一步提出蠕变期间发生元素扩散和γ′相定向生长的驱动力。

关键词：单晶镍基合金组织演化蠕变有限元分析

Effects of Salt Quenching Temperatures on Microstructure and Creep Properties of a PM Ni-based Superalloy

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Journal of Materials Science and Chemical Engineering 2013年第1期1卷 6-10页

作者： Jun Xie sugui tian Jiao Liu Xiaoming Zhou Beijing Institute of Aeronautical Materials Beijing 100095 China School of Materials Science and Engineering Shenyang University of Technology Shenyang 110870 China School of Materials Science and Engineering Shenyang University of Technology Shenyang 110870China

By means of the microstructure observation and creep properties measurement, an investigation has been made into the influence of the salt quenching temperatures on the microstructure and creep property of FGH95 superalloy. The results shown that, after full heat treatment, a high volume of g￠ phase and some granular carbide dispersedly precipitate in the matrix. Thereinto, as the molten salt temperature decreases from 650℃to520℃, the size of fine g￠ phase in the alloy decrease gradually and the amount of carbides increase in the alloy. And the alloy quenched in molten salt at520℃possesses better creep resistance due to the fact that there are more granular carbides precipitating in the alloy to enhance the grain strength. During creep, the deformation features of the alloy are that the configurations of stacking fault and slipping dislocations are activated in the alloy.

关键词： FGH95 Ni-Based Alloy Salt Quenching Temperature Microstructure Creep Property Deformation Feature

Microstructure and Creep Property of DZ125 Nickel-based Superalloy

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Microstructure and Creep Property of DZ125 Nickel-based Supe...

DZ125镍基合金蠕变期间的组织演化与元素扩散迁移率

中国材料大会2012

作者： sugui tian Xianlin Meng Ning tian Huichen Yu School of Materials Science and Engineering Shenyang University of Technology Beijing Institute of Aeronautical Materials

ISBN: (纸本)9783037856086

By means of creep property measurement and microstructure observation, an investigation has been made into the creep behaviors of DZ125 superalloy at high temperature and low stress. Results showed that the superalloy under the applied stress of 137MPa at 1293 K displayed a better creep resistance, and the apparent creep activation energy of the alloy during steady state creep was measured to be Q = 325.57 kJ/mol. The various microstructures were displayed in different regions of the sample, thereinto, the rafted γ’ phase was uniformly distributed in the regions far away from the fracture, but the twisted and coarser rafted γ’ phase appeared in the region near the fracture. The deformation mechanism of the alloy during steady state creep was the dislocations climbing over the rafted γ’ phase. In the later stage of creep, significant amount of dislocations shearing into the rafted γ’-phase promoted the initiation and propagation of the cracks along the boundaries up to the occurrence of fracture, which was though to the fracture mechanism of the alloy during creep.

关键词： DZ125 nickel-based superalloy Microstructure Creep property

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中国有色金属学报 2014年第2期24卷 335-342页

作者：田宁田素贵于慧臣孟宪林沈阳工业大学材料科学与工程学院沈阳110870 北京航空材料研究院北京100095

通过蠕变性能测试及组织形貌观察,结合元素扩散迁移率计算,研究DZ125合金在1 040℃蠕变期间的组织演化规律。结果表明:高温蠕变期间,合金在枝晶间/干区域发生不均匀的组织演化,枝晶间区域形成的筏状γ′相尺寸粗大,而枝晶干区域γ′相沿... 详细信息

通过蠕变性能测试及组织形貌观察,结合元素扩散迁移率计算,研究DZ125合金在1 040℃蠕变期间的组织演化规律。结果表明:高温蠕变期间,合金在枝晶间/干区域发生不均匀的组织演化,枝晶间区域形成的筏状γ′相尺寸粗大,而枝晶干区域γ′相沿(001)晶面形成细小的N-型筛网状筏形结构,且γ基体相连续充填在筛网状γ′相之间,可保证合金的高塑性。在1 040℃、137 MPa蠕变期间,合金枝晶干区域的γ′相经3 h转变成筏状结构,随施加应力的降低,γ′相发生筏形化转变的时间延长;其中,Al、Ta具有较高扩散迁移率是促使合金发生较快筏形化转变的主要原因。

关键词： DZ125镍基合金蠕变组织演化元素扩散迁移率

Effects of Long-term Aging Treatment on Stress Rupture Properties of FGH95 Ni-base Superalloy

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Effects of Long-term Aging Treatment on Stress Rupture Prope...

SINTERING BEHAVIOR OF Cu-Al ALLOY POWDER

中国材料大会2012

作者： sugui tian Guangliang Xie Jun Xie Xiaoming Zhou School of Materials Science and Engineering Shenyang University of Technology Beijing Institute of Aeronautical Materials

ISBN: (纸本)9783037856086

The effect of long-term aging on stress rupture properties was investigated by means of microstructure observation and properties measurement. The results showed that, after long-term aging for 500 h at 723 K, the coarser particle-like γ’ phase was precipitated along the grain boundaries of alloy, significant amount of γ’ particles were regularly distributed within the grain. Moreover, some carbide particles precipitated depressively along the boundaries and within the grain. As the aged time and temperature increased, the size of fine γ’ particles in the alloy increased slightly, and the stress rupture property of the alloy decreased under the condition of 923K and 1034MPa. The deformation features of the alloy during creep were that the dislocations slip in the matrix or shear into the γ’ phase, the dislocations shearing into the γ’ phase may be decomposed to form the configuration of the two partial-dislocations plus stacking fault. As the creep went on, the slipping traces with different orientations appeared in the surface of the specimen, and some slipping steps were formed in the region near the boundaries, which may cause the stress concentration to promote the initiation and propagation of the cracks along the boundaries up to creep fracture.

关键词： FGH95 alloy Long term aging Microstructure Stress Rupture Property

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Acta Metallurgica Sinica(English Letters) 1995年第3期8卷 231-234页

作者： tian sugui SHAO Huimeng ZHOU Longjiang LI Tiefan YANG Hongcai HAO Shiming(Shenyang Polytechnic University, China) (State Key Laboratory of Corrosion and Protection. Institute of Corrosion and Protection of Metals. Chinese Academy of Sciences, Shenyan Shenyang Polytechnic Univ Shenyang China

The dynamic behaviour of transient liquid phase during sintering 5wt% Al-Cu alloy compacts with green density of 7.56g/cn￣3 is observed by means of high temperature metallographic microscopy. The structures and precipitating order of the phases are identified by means of DTA, TEM and composion analysis at the definite point and phase diagram. The results show that little Al-rich liquid phase resulting from eutectic reaction flows into the capillaries in Cu powder, because the peritectic reactions exhausts the liquid in high density compact,the composition homogenization needs longer sintering time. The remainder γ2-phase is discovered at place of the neck of sintered Cu particle and has a crystallographic relationship of (111)_(Cu)∥(033)_γ_2 after alloy is sintered at 900 ℃for 3h.

关键词： transient liquid phase sintering surface reaction diffusing Cu-Al alloy

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镍基单晶合金高温蠕变变形与损伤行为

稀有金属材料与工程 2022年第1期51卷 44-51页

作者：闫化锦田素贵董志峰中国矿业大学(北京)机电与信息工程学院北京100083 沈阳工业大学材料科学与工程学院辽宁沈阳110870 贵州工程应用技术学院机械工程学院贵州毕节551700

通过蠕变性能测试和组织观察,研究了镍基单晶合金在高温蠕变期间的变形和损伤行为。结果表明,该合金在1040℃/137MPa条件下的蠕变寿命为556 h,表现出优异的蠕变抗力。合金在稳态期间的蠕变特性是位错在γ基体中滑移和攀移越过筏状γ′... 详细信息

通过蠕变性能测试和组织观察,研究了镍基单晶合金在高温蠕变期间的变形和损伤行为。结果表明,该合金在1040℃/137MPa条件下的蠕变寿命为556 h,表现出优异的蠕变抗力。合金在稳态期间的蠕变特性是位错在γ基体中滑移和攀移越过筏状γ′相。在蠕变后期,合金的变形特征是位错剪切进入筏状γ′相,剪切γ′相的位错可以交滑移,形成的Kear-Wilsdorf(K-W)锁可抑制位错的滑移和交滑移。位错的交滑移能够促使筏状γ/γ′两相的扭曲,致使沿γ/γ′界面的裂纹萌生及界面断裂,这是合金的损伤和断裂特征。而σ>η/α被认为是裂纹发生失稳扩展的条件。

关键词：镍基单晶合金组织结构蠕变变形机制损伤特征