Crack-tip plasticity mediated grain refinement and its resisting effect on the fatigue short crack growth

IF 9.4 1区材料科学 Q1 ENGINEERING, MECHANICAL International Journal of Plasticity Pub Date : 2024-08-15 DOI:10.1016/j.ijplas.2024.104102

Jianghua Li , Zhiyang Wang , Ningyu Zhang , Tao Shi , Elliot P. Gilbert , Gang Chen , Guian Qian

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Abstract

Fatigue short crack growth governed by the crack-tip plasticity dominates the fatigue life and strength of metallic materials or structural components. Here, for the first time, we discover a new mechanism of resisting fatigue short crack growth by grain refinement near the crack-tip driven by dynamic recrystallization in a Ni-based superalloy during high-cycle fatigue. The local cumulative plastic strain plays a determining role in the crack-tip grain refinement and concurrent dissolution of nanoprecipitation. Comprehensive microstructural analysis provides the evidence that the refined grains reduce the plastic micro-strain gradient in the vicinity of the crack-tip, which causes the crack blunting and deflection towards the interface of coarse-fine grains, hence decelerating the short crack growth. Although the grain refinement reduces the local stress threshold in the fine-grained areas (FGA), the dominant effects of FGA are identified to provide additional microstructural resistance to the propagation of short cracks.

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裂纹尖端塑性介导的晶粒细化及其对疲劳短裂纹增长的抑制作用

受裂纹尖端塑性支配的疲劳短裂纹增长对金属材料或结构组件的疲劳寿命和强度起着主导作用。在这里，我们首次发现了一种新的机制，即在高循环疲劳过程中，镍基超合金在动态再结晶的驱动下，通过裂纹尖端附近的晶粒细化来抵抗疲劳短裂纹的增长。局部累积塑性应变在裂纹尖端晶粒细化和同时发生的纳米沉淀溶解中起着决定性作用。全面的微观结构分析表明，细化晶粒降低了裂纹尖端附近的塑性微应变梯度，导致裂纹钝化并向粗-细晶粒界面偏转，从而减慢了短裂纹的增长速度。虽然晶粒细化降低了细晶粒区域（FGA）的局部应力阈值，但确定了 FGA 的主要作用是为短裂纹的扩展提供额外的微结构阻力。

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来源期刊

International Journal of Plasticity 工程技术-材料科学：综合

CiteScore

15.30

自引率

26.50%

发文量

256

审稿时长

46 days

期刊介绍： International Journal of Plasticity aims to present original research encompassing all facets of plastic deformation, damage, and fracture behavior in both isotropic and anisotropic solids. This includes exploring the thermodynamics of plasticity and fracture, continuum theory, and macroscopic as well as microscopic phenomena. Topics of interest span the plastic behavior of single crystals and polycrystalline metals, ceramics, rocks, soils, composites, nanocrystalline and microelectronics materials, shape memory alloys, ferroelectric ceramics, thin films, and polymers. Additionally, the journal covers plasticity aspects of failure and fracture mechanics. Contributions involving significant experimental, numerical, or theoretical advancements that enhance the understanding of the plastic behavior of solids are particularly valued. Papers addressing the modeling of finite nonlinear elastic deformation, bearing similarities to the modeling of plastic deformation, are also welcomed.