Cyclic stress–strain behavior of additively manufactured gamma prime strengthened superalloy at elevated temperatures

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL Theoretical and Applied Fracture Mechanics Pub Date : 2024-08-14 DOI:10.1016/j.tafmec.2024.104623

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Abstract

The γ́-precipitation hardened nickel-based superalloy IN939 manufactured by laser powder bed fusion (L-PBF) was subjected to cyclic loading to determine the cyclic stress–strain curve by short-cut procedure. The effect of building on loading direction/orientation was investigated. 〈0 0 1〉 crystallographic texture along the building direction was observed. The cyclic stress–strain curves were measured at 800 °C and 900 °C and the differences in cyclic plasticity were revealed. The specimens prepared by L-PBF with a building direction parallel to the loading axis exhibited the highest cumulative plastic deformation at both temperatures, while L-PBF with a building direction perpendicular to the loading axis was the lowest. Elastic moduli were determined and the differences were attributed to the crystallographic texture. In addition, conventionally cast IN939 was investigated as the reference material. Minor microstructural changes due to cyclic straining were inspected by transmission electron microscopy.

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加成法制造的伽马质强化超级合金在高温下的循环应力应变行为

对通过激光粉末床熔融（L-PBF）制造的γ-沉淀硬化镍基超耐热合金 IN939 进行了循环加载，并通过捷径程序确定了循环应力-应变曲线。研究了建筑对加载方向/方位的影响。沿堆积方向观察到了〈0 0 1〉结晶纹理。在 800 °C 和 900 °C 下测量了循环应力-应变曲线，发现了循环塑性的差异。通过 L-PBF 制备的试样在两个温度下的累积塑性变形最大，而通过 L-PBF 制备的试样在两个温度下的累积塑性变形最小。弹性模量已测定，差异归因于结晶纹理。此外，还对传统铸造的 IN939 作为参考材料进行了研究。透射电子显微镜检查了循环应变引起的微观结构变化。

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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.