喷丸直径对GH4169合金性能和损伤演化的影响

doi:10.13251/j.issn.0254-6051.2022.09.009

摘要/Abstract

摘要： 采用半自动光学显微镜、激光共焦显微镜、MTS-Landmark电液伺服力学性能试验机等设备,研究了GH4169合金经不同直径弹丸喷丸处理后的微观组织和力学性能。利用数字图像相关方法(DIC),对材料单轴拉伸过程的表观损伤演化行为进行分析。结果表明,随着弹丸直径由ϕ0.6 mm增大到ϕ4.3 mm,GH4169合金的表面细晶层厚度由420 μm 增大到530 μm,其表面粗糙度最大较原始试样增大了80.8%。喷丸处理后,材料的屈服强度和抗拉强度均有所提高,其伸长率下降。随着塑性变形增加,喷丸前后GH4169合金的损伤演化规律相似,变形初期材料发生均匀变形且变形缓慢,损伤因子达到临界值后材料开始快速损伤。喷丸直径越大,临界塑性应变越小,材料越早发生快速损伤。建立了不同喷丸直径GH4169合金的损伤演化方程,对喷丸强化材料的寿命评估具有重要意义。

关键词: GH4169合金, 喷丸, 力学性能, 损伤演化, 数字图像相关

Abstract: Microstructure and mechanical properties of GH4169 alloy after shot peening with different projectile diameters were studied by semi-automatic optical microscope, laser scan confocal microscope and MTS-Landmark mechanical property test machine. The apparent damage evolution of the GH4169 alloy was analyzed during uniaxial tensile process by digital image correlation method (DIC). The results show that as the projectile diameter increases from ϕ0.6 mm to ϕ4.3 mm, the surface fine-grained layer thickness of GH4169 alloy increases from 420 μm to 530 μm and its surface roughness increases by a maximum of 80.8% compared to the original specimen. After shot peening, the yield strength and tensile strength of the material are increased and its elongation decreases. The damage evolution law of the GH4169 alloy is similar before and after shot peening with the increase of plastic deformation. The material appears uniform and slow deformation in the initial stage, and begins to be damaged rapidly when the damage factor reaches the critical value. The larger the shot peening diameter is, the smaller the critical plastic strain is, and the faster the material damage occurs. The damage evolution equation of GH4169 alloy is established, which has a great significance to the life assessment of shot peening reinforced materials.

Key words: GH4169 alloy, shot peening, mechanical properties, damage evolution, digital image correlation

中图分类号:

李磊, 朱旭军, 张丽, 田福政. 喷丸直径对GH4169合金性能和损伤演化的影响[J]. 金属热处理, 2022, 47(9): 47-53.

Li Lei, Zhu Xujun, Zhang Li, Tian Fuzheng. Effect of shot peening diameter on properties and damage evolution of GH4169 alloy[J]. Heat Treatment of Metals, 2022, 47(9): 47-53.

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