首页|脉冲磁场强度对GH99镍基合金力学和微动磨损性能的影响

脉冲磁场强度对GH99镍基合金力学和微动磨损性能的影响

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为研究不同磁场强度对镍基合金力学性能和耐磨性能的影响规律,在脉冲强磁场设备上对GH99镍基合金试样进行脉冲磁处理.通过观察显微结构,分析了GH99镍基合金的磨损机理和强化机制.结果表明:外加脉冲磁场可改善材料位错分布,减小试样表面残余应力的分散性;在磁场强度为10 T时残余压应力达到最大值(-223.45 MPa),且此时材料拉伸断口的特征主要表现为韧性断裂,脉冲磁场处理合金产生亚结构位错胞有助于发挥细晶强化作用;在0～15T范围内,随磁场强度增大,材料表面显微硬度和耐磨性能呈现先增强后减弱的规律,在脉冲磁场作用下合金材料内部的位错发生增殖致使位错密度增大,产生类似加工硬化现象,但磁场强度过大会导致位错塞积从而造成晶胞点阵畸变严重,出现材料性能恶化.
Effect of Pulsed Magnetic Field Strength on Mechanical and Micro-motion Wear Properties of GH99 Nickel-Based Alloy
In order to investigate the influence of different magnetic field strengths on the mechanical property and wear resistance of nickel-based alloy,GH99 nickel-based alloy specimen was subjected to pulsed magnetic treatment by the pulsed strong magnetic field equipment.Through the microstructure observation,the wear mechanism and strengthening mechanism of GH99 nickel-based alloy were analyzed.Results show that the applied pulsed magnetic field improves the material dislocation distribution and reduces the dispersion of residual stress on the specimen surface.At the magnetic field strength of 10 T,the residual compressive stress reaches the maximum value(-223.45 MPa).The tensile fracture of the material is mainly characterized by the ductile fracture.This is because the pulsed magnetic field treatment of the alloy produces sub-structured dislocation cells,which contributes to the fine grain strengthening effect.In addition,the surface microhardness and wear resistance of the specimen are firstly increased and then decreased with increasing the magnetic field strength from 0 T to 15 T.The dislocations inside the alloy proliferate under the pulsed magnetic field,increasing the dislocation density and resulting in the phenomenon similar to the process hardening.However,excessive magnetic field strength may lead to the dislocation plugging,resulting in severe distortion of the cell dot and deterioration of material properties.

pulsed magnetic fieldmagnetic field strengthGH99 nickel-based alloymechanical propertywear resistance

周安阳、黄艳斐、郭伟玲、邢志国、王海斗、王志远、张艳芳

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陆军装甲兵学院装备再制造技术国防科技重点实验室,北京 100072

陆军装甲兵学院机械产品再制造国家工程研究中心,北京 100072

哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨 150001

中国人民解放军总医院第七医学中心 口腔科,北京 100000

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脉冲磁场 磁场强度 GH99镍基合金 力学性能 耐磨性能

National Natural Science Foundation of ChinaNational Natural Science Foundation of China

5227522752130509

2024

10.12442/j.issn.1002-185X.20230341

稀有金属材料与工程
中国有色金属学会,中国材料研究学会,西北有色金属研究院

稀有金属材料与工程

CSTPCD北大核心
影响因子：0.634
ISSN：1002-185X
年,卷(期)：2024.53(2)
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