高<strong>W</strong>高<strong>Ta</strong>型粉末高温合金的蠕变性能及溶质原子偏聚

doi:10.11900/0412.1961.2023.00138

金属学报

2023, Vol. 59

Issue (9): 1230-1242 DOI: 10.11900/0412.1961.2023.00138

研究论文

本期目录 | 过刊浏览

高W高Ta型粉末高温合金的蠕变性能及溶质原子偏聚

白佳铭¹^,²^,³, 刘建涛¹^,², 贾建¹^,², 张义文¹^,²(

)

¹钢铁研究总院高温材料研究所北京 100081
²北京钢研高纳科技股份有限公司北京 100081
³东北大学材料科学与工程学院沈阳 110819

Creep Properties and Solute Atomic Segregation of High-W and High-Ta Type Powder Metallurgy Superalloy

BAI Jiaming¹^,²^,³, LIU Jiantao¹^,², JIA Jian¹^,², ZHANG Yiwen¹^,²(

)

¹High Temperature Material Research Institute, Central Iron and Steel Research Institute, Beijing 100081, China
²Gaona Aero Material Co. Ltd., Beijing 100081, China
³School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

引用本文:

白佳铭, 刘建涛, 贾建, 张义文. 高W高Ta型粉末高温合金的蠕变性能及溶质原子偏聚[J]. 金属学报, 2023, 59(9): 1230-1242.
Jiaming BAI, Jiantao LIU, Jian JIA, Yiwen ZHANG. Creep Properties and Solute Atomic Segregation of High-W and High-Ta Type Powder Metallurgy Superalloy[J]. Acta Metall Sin, 2023, 59(9): 1230-1242.

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摘要:

研究了最新开发的高W高Ta型粉末高温合金GNPM01优异的蠕变性能和蠕变强化机理。利用球差校正扫描透射电子显微镜(AC-STEM)，详细分析了粉末高温合金GNPM01蠕变变形机制和溶质原子在超点阵层错和微孪晶上的偏聚行为，阐明了溶质原子Cr、Co、Mo的偏聚是导致无序微孪晶在晶内扩展的根本原因。GNPM01合金在815℃蠕变过程中，γ'相内孤立的超点阵外禀层错(SESF)处出现了W、Ta、Nb、Co和Ti的Suzuki偏聚，并且偏聚原子具有有序的占位，造成SESF处发生局部微区相变(LPT)，形成的[(Ni, Co)₃(Ti, Nb, Ta, W)]有序相η相能有效阻碍微孪晶的形成和扩展，从而降低合金的蠕变速率。

关键词 ：粉末高温合金, W, Ta, 蠕变机制, 局部微区相变, 微孪晶

Abstract：

Developing superalloys and improving their temperature capability are extremely crucial for the advancement of aero-engines. The powder metallurgy (PM) technology can prevent the macroscopic segregation caused by casting and create a high-alloying aero-engine turbine disk alloy having remarkable microstructural homogeneity and superior thermal capability. PM superalloys have been developed into the 3rd generation alloys for decades, and alloys such as René104 already entered service. The chemical composition of the 4th generation PM superalloy is still being researched with the aim of increasing the temperature capability for disk applications to 815^oC. In this work, the remarkable creep resistance and creep strengthening mechanism of a novel high-W and high-Ta type PM superalloy GNPM01 was examined. The creep deformation mechanism of GNPM01 alloy and the segregation of elements on deformation defects were investigated using advanced spherical aberration-corrected scanning transmission electron microscopy. The results reveal that the creep resistance of GNPM01 alloy is considerably higher than that of the 3rd generation PM superalloy. The temperature capacity of GNPM01 alloy is approximately 40^oC greater than that of FGH4098 alloy under the creep condition of 600 MPa and 1000 h. The creep strength of GNPM01 alloy is approximately 160 MPa higher than that of the FGH4098 alloy at 815^oC. In the experimental conditions, the creep deformation behavior was dominated by deformed microtwins, and the GNPM01 alloy clearly slowed down the widening of extended stacking faults and the thickening of microtwins during the creep deformation. It was discovered that the element enrichment of Co, Cr, and Mo existed in the microtwins, and the phase transformation of the twin-structure in γ' phase was disordered because of the segregation of Co, Cr, and Mo by atomic-level energy dispersive X-ray spectroscopy. The isolated superlattice stacking faults in FGH4098 alloy also occurred in the disordered phase transitions. The disordering of superlattice stacking fault or microtwin structure was due to the segregation of Cr, Co, and Mo, which also resulted in the a / 6<112> Shockley partials shearing γ′ phase without producing high-energy nearest-neighbor Al—Al bonds. The segregation disordered the L1₂ structure resulted in reduced pinning of partials by the ordered γ′ phase, which increased the creep rate of the alloy. During the GNPM01 alloy creeping at 815^oC, solute atoms W, Ta, and Nb segregated at the isolated superlattice extrinsic stacking fault (SESF) had ordered atomic occupancy. The fault-level local phase transformation occurred in isolated SESF, forming the [(Ni, Co)₃(Ti, Nb, Ta, W)] ordered η phase that can effectively inhibit the formation and expansion of microtwins, thus lowering the creep rate of GNPM01 alloy.

Key words： powder metallurgy superalloy W Ta creep mechanism local phase transformation microtwin

收稿日期: 2023-04-03

ZTFLH:

TG123.3

基金资助:国家科技重大专项项目(2017-VI-0008-0078)

作者简介: 白佳铭，男，1994年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2023.00138 或 https://www.ams.org.cn/CN/Y2023/V59/I9/1230

表1 GNPM01、FGH4098[24]和FGH4096[24]合金的化学成分 (mass fraction / %)

图1 标准热处理态GNPM01和FGH4098合金的晶界及γ′相形貌

图2 标准热处理态GNPM01和FGH4098合金中取向差角的分布及γ和γ′相中的溶质原子浓度

图3 利用Larson-Miller关系对FGH4096、FGH4098和GNPM01合金持久强度外推的结果

图4 GNPM01与FGH4098合金不同条件下的蠕变应变-蠕变时间曲线和蠕变应变速率-蠕变时间曲线

图5 FGH4098和GNPM01合金在650℃、980 MPa蠕变断裂后的位错亚结构

图6 650℃、980 MPa蠕变断裂后FGH4098合金中微孪晶附近的STEM-LAADF像、STEM-HAADF像及EDS元素面分布图

图7 650℃、1100 MPa蠕变断裂后GNPM01合金中微孪晶处STEM-HAADF像及EDS元素面分布图

图8 FGH4098和GNPM01合金在750℃蠕变断裂后侧立的微孪晶的TEM-BF像(BD//<011>晶带轴)

图9 815℃、460 MPa蠕变断裂后FGH4098和GNPM01合金变形组织的位错亚结构

图10 815℃、460 MPa蠕变断裂后GNPM01合金中孤立的超点阵层错处的STEM-HAADF像及EDS分析

图11 FGH4098和GNPM01合金中微孪晶上具有原子占位信息的STEM-HAADF像及高分辨EDS元素面分布图

图12 FGH4098合金中孤立超点阵外禀层错(SESF)的STEM-HAADF像、相应位置的衬度强度分布及原子级别EDS元素面分布图

图13 GNPM01合金中孤立SESF的STEM-HAADF像、相应位置的衬度强度分布及原子级别EDS元素面分布图

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