Mechanism of hydrogen-restrained crack propagation and practical application research of thermohydrogen treatment in a TiAl-based alloy |
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| Affiliation: | 1. School of Mechanical Engineering, University of Jinan, Jinan 250022, China;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;3. Department of Mechanical Engineering, Shandong Jiaotong University, Jinan 250022, China;1. Materials Research Simulation Laboratory, Department of Physics, Bahauddin Zakariya University, Multan, 60800, Pakistan;2. Department of Physics, Govt. College University, Faisalabad, 38000, Pakistan;3. Centre for Advanced Studies in Physics, Govt. College University, Lahore, 54000, Pakistan;1. División de Estudios de Posgrado e Investigación, Instituto Tecnológico de Toluca Metepec, C.P. 52149, Estado de México, Mexico;2. Área de Física Atómica Molecular Aplicada, Universidad Autónoma Metropolitana Azcapotzalco, C.P. 02200, Azcapotzalco, México City, Mexico;1. State Key Laboratory for Powder Metallurgy, Central South University, Changsha, China;2. School of Chemistry and Chemical Engineering, Central South University, Changsha, China;3. Hunan YouXian No.1 Middle School, Zhuzhou, China;1. College of Materials Science and Engineering, Hunan University, Changsha 410082, PR China;2. State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, PR China;3. College of Finance and Statistics, Hunan University, Changsha 410082, PR China;1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;2. College of Science, Sichuan Agricultural University, Ya''an 625014, China;3. Department of Physics, Chengdu University of Technology, Chengdu 610059, China |
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| Abstract: | The mechanism of hydrogen-restrained crack propagation and practical application of thermohydrogen treatment in a TiAl-based alloy was investigated in this study. Hydrogenated and unhydrogenated alloys were subjected to high-temperature compression test, with a temperature range 1050–1200 °C and strain rate range 0.001–1 s−1. The results showed that crack propagation was restrained due to hydrogen addition. The main mechanism of hydrogen-restrained crack propagation of such alloy was revealed that hydrogen-promoted lamella bending and hydrogen-decreased Young's modulus induced inter-lamellar cracks transforming into trans-lamellar cracks, decreasing cracks in the hydrogenated alloy. Additionally, hydrogen-induced mechanical twinning in γ-phase lamellae partly restrained inter-lamellar crack propagation. In the two-step forging process, the optimum forging parameters were determined. It was found that hydrogen could effectively restrain crack propagation during the two-step forging process. Hydrogen refined grains of the forged billets, which improved toughness of such billets. The hydrogen content of the forged hydrogenated billets could be decreased to a desired value, and the phase composition and content were basically identical to those of the initial unhydrogenated alloy. |
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| Keywords: | TiAl-based alloy Hydrogen Crack propagation Forging Microstructure |
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