1. Research on fatigue crack growth behavior of commercial pure titanium base metal and weldment at different temperatures.
- Author
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Lu, Lei, Li, Jian, Su, Chuan-Yi, Sun, Peng-Yan, Chang, Le, Zhou, Bin-Bin, He, Xiao-Hua, and Zhou, Chang-Yu
- Subjects
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FATIGUE crack growth , *TITANIUM alloys , *MICROSTRUCTURE , *METALS testing , *FINITE element method , *ALLOY testing - Abstract
Highlights • The effect of load ratio and temperature on FCG rates for base metal and weldment are investigated. • The FCG rate of base metal is quicker than that of weldment, which is mainly due to microstructure. • The monotone plastic zone is larger than that of cyclic plastic zone. Abstract In this paper, the effects of load ratio and temperature on fatigue crack growth (FCG) rates for commercial titanium alloy (CP-Ti) base metal and its weldment are investigated by experiments. Results show that the fatigue crack growth (FCG) rate of weldment is slower than that of base metal, which is mainly due to the difference of the microstructures between them. The microstructures at the weld are coarse grains and acicular martensite, which can reduce the FCG rate of weldment. The effect of load ratio on FCG rate will gradually weaken or even disappear with the increase of temperature. Also, the effect of temperature on FCG rate will gradually weaken or disappear with the increase of secondary cracks on the fracture surface. The results of finite element simulation show the FCG rate will be increased with the increase of plastic zone size and plastic strain, the increase of load ratio and temperature will reduce the FCG rate difference between weldment and base metal. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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