Study on crack growth and fatigue life in TC6 titanium alloy by integrated phase proportion and grain size modeling

Zhang, Jie; Wu, Hejun; Wang, Yuting; Zhou, Jianqiu

doi:10.1016/j.engfracmech.2020.107235

Cited by 9 publications

(1 citation statement)

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“…Fujita et al [ 18 ] have found that grain refinement is an effective approach for increasing the fatigue limit of CrMnFeCoNi alloy because of both the Hall–Petch effect and the increase in the fatigue crack initiation resistance. Zhang et al [ 19 ] have proved that the grain size and phase proportion can efficaciously affect crack growth and fatigue life according to quantitative analysis results. Chen et al [ 20 ] found the fatigue crack growth rate is monotonically decreased by 10 times when the grain size is increased from 10 to 235 nm.…”

Section: Introductionmentioning

confidence: 99%

A Novel Heat Treatment Strategy Based on Quenching and Carbides Preprecipitation and Subsequent Critical Quenching to Improve the Thermal Fatigue Performance of AISI H13 Tool Steel

Zhang

Tang

Yue

et al. 2023

steel research int.

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The effects of conventional quenching and based on quenching and carbides preprecipitation and subsequent critical quenching (QPQ) processes on the microstructure evolution, thermal stability and thermal fatigue are studied for H13 tool steel. The results show that the QPQ treatment is beneficial to precipitate smaller and more uniformly distributed carbides during the tempering. According to the analysis of microstructure and mechanical properties, it is found that the tempering after QPQ treatment can refine the grain size of the steel by about 60% and can increase the impact toughness by 34.8%. Moreover, it is also found that the activation energy required by the QPQ treatment is higher than that of the conventional quenched samples for long‐time tempering, which is mainly related to the coarsening and accumulation of carbides. According to the statistical analysis results of average thermal fatigue crack length, crack density, and surface hardness, the improvement of thermal fatigue performance of the QPQ treatment after tempering is mainly attributed to the uniform fine carbide and grain refinement, which passivates the crack tip and improves the service life to a certain extent.

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Section: Introductionmentioning

confidence: 99%