新型<strong>Ni-Co</strong>基高温合金塑性变形连接中界面组织演化及愈合机制

doi:10.11900/0412.1961.2020.00493

金属学报

2022, Vol. 58

Issue (2): 129-140 DOI: 10.11900/0412.1961.2020.00493

研究论文

本期目录 | 过刊浏览

新型Ni-Co基高温合金塑性变形连接中界面组织演化及愈合机制

任少飞¹^,², 张健杨², 张新房¹(

), 孙明月²^,³(

), 徐斌²^,³, 崔传勇⁴

^1.北京科技大学冶金与生态工程学院北京 100083
^2.中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
^3.中国科学院金属研究所中国科学院核用材料与安全评价重点实验室沈阳 110016
^4.中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016

Evolution of Interfacial Microstructure of Ni-Co Base Superalloy During Plastic Deformation Bonding and Its Bonding Mechanism

REN Shaofei¹^,², ZHANG Jianyang², ZHANG Xinfang¹(

), SUN Mingyue²^,³(

), XU Bin²^,³, CUI Chuanyong⁴

^1.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
^2.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Key Laboratory of Nuclear Materials and Safety, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^4.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

任少飞, 张健杨, 张新房, 孙明月, 徐斌, 崔传勇. 新型Ni-Co基高温合金塑性变形连接中界面组织演化及愈合机制[J]. 金属学报, 2022, 58(2): 129-140.
Shaofei REN, Jianyang ZHANG, Xinfang ZHANG, Mingyue SUN, Bin XU, Chuanyong CUI. Evolution of Interfacial Microstructure of Ni-Co Base Superalloy During Plastic Deformation Bonding and Its Bonding Mechanism[J]. Acta Metall Sin, 2022, 58(2): 129-140.

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摘要:

为解决镍基高温合金的焊接难题，以新型Ni-Co基高温合金为实验材料，采用塑性变形连接的新方法，实现了新型Ni-Co基高温合金的连接。通过OM、EBSD、TEM等分析手段探究了界面的再结晶行为及界面的愈合机制。结果表明，1150℃进行塑性变形连接时，合金的变形抗力小，不易开裂。不同变形量的连接实验表明，在40%的变形量下，合金可以实现界面的完全愈合，其力学性能达到基体同等水平。在塑性变形过程中，界面附近的粗大晶粒首先发生细化，随着变形量的增加，细化的晶粒在连续动态再结晶的辅助作用下，通过界面晶界的迁移消除了原始连接界面，实现界面的愈合。

关键词 ： Ni-Co基高温合金, 塑性变形连接, 动态再结晶

Abstract：

Superalloys with excellent high-temperature resistance and oxidation resistance have been widely used in aviation and energy fields. The new Ni-Co base superalloy is considered a candidate for the next generation of turbine discs due to its higher performance of mechanical properties and microstructure stability at high temperatures. However, tungsten inert gas (TIG) welding, metal inert gas (MIG) welding, and other welding techniques are not suitable for welding the new Ni-Co base superalloy because the Al + Ti content of the alloy reaches 7.5%, while traditional welding techniques (electron beam welding, friction welding, and diffusion welding) also have some disadvantages. For example, friction welding has certain requirements on the shape of the sample, and it is not suitable for welding large-volume alloys. Diffusion welding requires a long heat retention period and a harmful precipitation phase exists at the interface. A new welding method is applied in this study to solve the problem of welding nickel-based superalloy, achieving a better bonding effect. The Gleeble 3500 thermal simulator was used to study the plastic deformation bonding of Ni-Co base superalloys in a temperature range of 1000-1200^oC and a strain range of 5%-40% with a strain rate of 0.001 s^-1. The recrystallization behavior of the interface was studied by OM, EBSD, and TEM, and the bonding mechanism of the interface was clarified. The results showed that the resistance to deformation of the alloy was low when the plastic deformation bonding was performed at 1150^oC, and there was no risk of cracking of the alloy. Plastic deformation bonding experiments with different deformations had shown that the alloy can achieve complete bonding of the interface under the condition of 40% deformation, and its mechanical properties can reach the same level as the matrix. The tensile fracture analysis showed that the fracture profile of the 40% deformed joint was consistent with the base material, showing a ductile fracture pattern. The results of EBSD and TEM showed that the coarse grains near the interface were first refined during the plastic deformation. With the increase of deformation, the refined grain removed the original interface by the migration of the interfacial grain boundaries with the assistance of a continuous dynamics recrystallization process and ultimately led to the bonding of the interface.

Key words： Ni-Co base superalloy plastic deformation bonding dynamic recrystallization

收稿日期: 2020-12-07

ZTFLH:

TG406

基金资助:国家重点研发计划项目(2018YFA0702900);国家自然科学基金项目(51774265);国家科技重大专项项目(2019ZX06004010);中国科学院2017年度创新交叉团队和中国科学院青年创新促进会项目

作者简介: 孙明月，mysun@imr.ac.cn，主要从事特殊钢与大锻件材料及先进控形控性技术研究
任少飞，男，1993年生，硕士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00493 或 https://www.ams.org.cn/CN/Y2022/V58/I2/129

图1 实验原理示意图(a) schematic of plastic deformation bonding (b, c) schematics and location of tensile specimen processing (unit: mm) (d) dimensions of the tensile test specimen (t—thickness) (unit: mm)

图2 Ni-Co基高温合金铸态组织及均匀化态显微组织的OM像

图3 应变速率为0.001 s-1，不同变形温度下Ni-Co基高温合金显微组织的OM像及其流变应力-应变曲线

图4 塑性变形温度为1150℃，不同变形量下Ni-Co基高温合金显微组织的OM像以及平均晶粒尺寸统计

图5 不同变形量下接头的室温拉伸曲线

图6 不同变形量下接头和母材的拉伸断口形貌

图7 塑性变形温度为1150℃时,不同变形量下界面组织的反极图(IPF)及对应的局部取向差(LAM)图(a, b) 5% (c, d) 10% (e, f) 20% (g, h) 30% (i, j) 40%

图8 塑性变形温度为1150℃，不同变形量下界面组织的取向差分布(a) 5% (b) 10% (c) 20% (d) 30% (e) 40%

图9 变形温度为1150℃，20%变形量下界面组织的TEM像

图10 塑性变形连接界面愈合机制(a) original coarse grains (b, c) grain refinement near the interface (d, e) bulging of the interfacial grains (Fig.10e shows the recrystallization nucleation of interfacial grains) (f) bonding of the interface

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