Fracture toughness and fatigue crack growth in DMLS Co-Cr-Mo alloy: Unraveling the role of scanning strategies

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2024-09-14 DOI:10.1016/j.tafmec.2024.104681

Vinod Kumar Jat , R.U. Patil , V.K. Yadav

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引用次数: 0

Abstract

Co-Cr-Mo alloy is crucial for biomedical implants and aerospace components. These parts often exhibit a high level of geometric intricacy. Direct metal laser sintering (DMLS) is ideal for these complex parts. In DMLS, choosing the right scanning strategies is vital, as it significantly affects the fatigue fracture behavior of the printed components. Thus, the present study investigates the effect of different scanning strategies (stripe, meander, and chessboard) on the fracture toughness and fatigue crack growth behavior of DMLS printed Co-Cr-Mo alloy. For each scanning strategy, fatigue crack growth tests have been performed to evaluate the threshold stress intensity factor and Paris law constants. To corroborate the obtained experimental results, microstructure analyses have been performed using electron backscattered diffraction. Further, failure mechanisms have been identified from fractographs obtained using field emission scanning electron microscopy. It is evident from the obtained test results that scanning strategies caused significant variation in fracture toughness and fatigue crack growth behavior. The stripe scanning strategy has exhibited higher resistance to fracture and fatigue crack growth. However, delayed crack initiation has been observed in the case of the chessboard scanning strategy. The present study provide the background for better selection of scanning strategies to mitigate fatigue fracture in DMLS-printed Co-Cr-Mo alloy designed for specific applications.

查看原文本刊更多论文

DMLS Co-Cr-Mo 合金的断裂韧性和疲劳裂纹生长：揭示扫描策略的作用

Co-Cr-Mo 合金对生物医学植入物和航空航天部件至关重要。这些部件通常具有高度复杂的几何形状。直接金属激光烧结（DMLS）是这些复杂部件的理想选择。在 DMLS 中，选择正确的扫描策略至关重要，因为这会极大地影响打印部件的疲劳断裂行为。因此，本研究调查了不同扫描策略（条纹、蜿蜒和棋盘）对 DMLS 印刷 Co-Cr-Mo 合金断裂韧性和疲劳裂纹生长行为的影响。针对每种扫描策略，都进行了疲劳裂纹生长测试，以评估阈值应力强度因子和帕里斯定律常数。为了证实实验结果，还使用电子反向散射衍射进行了微观结构分析。此外，还利用场发射扫描电子显微镜从断裂图中确定了失效机制。从获得的测试结果可以看出，扫描策略导致了断裂韧性和疲劳裂纹生长行为的显著变化。条纹扫描策略表现出更高的抗断裂和抗疲劳裂纹生长能力。然而，在棋盘式扫描策略中观察到了延迟裂纹起始。本研究为更好地选择扫描策略提供了背景资料，以减轻为特定应用而设计的 DMLS 印刷 Co-Cr-Mo 合金的疲劳断裂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.