617M合金在不同试验温度和热时效条件下裂纹扩展的试验研究与数值模拟

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-09-02 DOI:10.1016/j.tafmec.2025.105217

Md Rakim , Sanjib Kumar Acharyya , Sankar Dhar , Aniruddha Moitra

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引用次数: 0

摘要

近年来，617M合金仍然是一种很有前途的高温材料，特别是用于先进超超临界（AUSC）电厂的部件。这些部件暴露在机械和热负荷（静态和循环）下。因此，这些材料容易受到疲劳、断裂和蠕变破坏的影响。本文对617M合金在750℃下的弹塑性断裂和10000 h的热时效进行了研究。在710℃时效温度下制备了不同时效条件的试样。进行拉伸、硬度和断裂试验，获得拉伸、硬度和断裂性能。观察了不同时效时间和试验温度下的力学性能和断裂韧性变化（JIC和J-Δa曲线）。利用Abaqus有限元平台模拟裂纹扩展，研究裂纹尖端约束和塑性区随时效时间和试验温度的变化规律。实验中观察到的断裂行为随时效时间的变化可以用微观组织中的析出形貌来解释。

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Experimental investigation and numerical simulation of a growing crack in Alloy 617M under different test temperatures and thermal ageing conditions

In recent era, Alloy 617M remains as a promising material for high temperature application specially for components of advanced ultra-super critical (AUSC) power plant. Those components are exposed to mechanical and thermal loads (static and cyclic). Therefore, those are susceptible to fatigue, fracture and creep failures. In this paper, Alloy 617M is investigated for elastic–plastic fracture up to test temperature of 750 °C and thermal ageing up to 10,000 h. The specimens are prepared at 710 °C ageing temperature with different ageing conditions. Tensile, hardness and fracture tests are conducted to obtain tensile, hardness and fracture properties. Variations of mechanical properties and fracture toughness (

J_{IC}

and

J - Δ a

curve) are observed with different ageing times and test temperatures. Abaqus finite element (FE) platform is used to simulate crack growth and to investigate the variations of crack tip constraint and plastic zone with ageing times and test temperatures. The variations in fracture behavior with ageing time as observed in experiments have been explained in terms of precipitation morphology in the microstructure.

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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.