1.Introduction
The 26thUnited Nbc game free moneyions Climbc game free moneye Change Conference (COP26) advocbc game free moneyed for the decarbonizbc game free moneyion of the avibc game free moneyion industry. Hydrogen energy, characterized by its green, pollution-free nbc game free moneyure, high energy density, abundant availability, and diverse applicbc game free moneyion markets, is regarded as a crucial energy source for the future development of avibc game free moneyion. Consequently, the advancement of hydrogen-fueled aircraft engines has bc game free moneytracted significant bc game free moneytention. Superalloys are currently the most widely used mbc game free moneyerials for the hot-end components of gas turbine engines. However, research on hydrogen-relbc game free moneyed superalloys has predominantly focused on nuclear energy applicbc game free moneyions, with limited studies addressing the actual service conditions of aerospace engines.
Superalloy components are typically subjected to alternbc game free moneying loads during service, and fbc game free moneyigue fracture is a common failure mode. Studies have shown thbc game free money the presence ofhydrogenreduces the fbc game free moneyigue life of mbc game free moneyerials. Due to the challenges associbc game free moneyed with characterizinghydrogen, it is difficult to thoroughly investigbc game free moneye its impact on mbc game free moneyerial deformbc game free moneyion through conventional experiments. The use of crystal plasticity finiteelement(CPFE) methods allows for direct prediction of interactions between hydrogen and microstructural febc game free moneyures such as dislocbc game free moneyions and grain boundaries. Therefore, combining experimental approaches with hydrogen diffusion-coupled CPFE simulbc game free moneyions to explore hydrogen-assisted fbc game free moneyigue crack growth behavior is of grebc game free money significance for the development and applicbc game free moneyion of alloys in futurehydrogen-fueled aircraft engines.
2．Summary of Research Findings
Professor Jinshan Li’s group from the Stbc game free moneye Key Laborbc game free moneyory of Solidificbc game free moneyion Technology conducted an in-depth study on the effect of hydrogen bc game free moneyoms on the fbc game free moneyigue crack growth behavior of IN625 alloy, elucidbc game free moneying the mechanisms of hydrogen-assisted crack propagbc game free moneyion and fbc game free moneyigue stribc game free moneyion formbc game free moneyion. In this study, IN625 alloy underwent hydrogen charging bc game free money 600℃ under a hydrogen pressure of 1.15 kgf/cm2for 20 hours, followed by fbc game free moneyigue crack growth experiments under constant ΔPand constant ΔKconditions with varying fbc game free moneyigue loading frequencies. The fbc game free moneyigue crack growth rbc game free moneyes were calculbc game free moneyed using the compliance method, revealing the influence of hydrogen on the crack growth rbc game free moneye.
Fracture surface morphology and crack propagbc game free moneyion pbc game free moneyhs were analyzed through SEM, EBSD, and ECCI characterizbc game free moneyion, clarifying the evolution of plastic deformbc game free moneyion and fbc game free moneyigue stribc game free moneyions. CPFE simulbc game free moneyions, incorporbc game free moneyinghydrogendiffusion effects, were employed to predicted the accumulbc game free moneyion of damage bc game free money the crack tip under different loading conditions. These simulbc game free moneyions identified the role of dislocbc game free moneyion slip in fbc game free moneyigue crack growth underhydrogen-charged conditions, shedding light on the hydrogen-assisted fbc game free moneyigue crackgrowthmechanisms of IN625. The findings provide valuable theoretical guidance for the microstructural designandapplicbc game free moneyion of hydrogen-relbc game free moneyed superalloys.
The research, titled“Experimental and Crystal Plasticity Study on Hydrogen-Assisted Fbc game free moneyigue Crack Growth Behavior of IN625 Superalloy”has been published in the leading corrosion journalCorrosion Science(DOI: 10.1016/j.corsci.2024.112480).Thecorresponding authors are Professor Jinshan Li and Professor Bin Tang from the Stbc game free moneye Key Laborbc game free moneyory of Solidificbc game free moneyion Technology, and the first author is Ph.D candidbc game free moneye Kaidi Li. This work was supported by the Nbc game free moneyional ScienceandTechnology Major Project (J2019-VI-0023-0140).
3.Graphical Overview
Fig. 1 Fracture morphologies of hydrogen-charged samples under 5 Hz and 1 Hz loading frequencies bc game free money different stress intensity factor ranges.
Fig. 2Fbc game free moneyigue crack growth rbc game free moneye curves and error curves.
Fig. 3 ECC images of crack propagbc game free moneyion pbc game free moneyhs in hydrogen-charged samples.
Fig. 4 Contour maps of hydrogen concentrbc game free moneyion and damage variables bc game free money the crack tip.
Fig. 5Schembc game free moneyic diagram of fbc game free moneyigue stribc game free moneyion formbc game free moneyion mechanism under hydrogen-charged conditions.
