Fatigue crack growth behaviors of a new burn-resistant highly-stabilized beta titanium alloy
来源期刊：Rare Metals2009年第6期
论文作者：WU Huana, b, ZHAO Yongqinga, b, ZENG Weidonga, b, and QIAN Lib a School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an , China b Titanium Alloy Research Center, Northwest Institute for Nonferrous Metal Research, Xi’an , China
文章页码：545 - 549
摘 要：This article presents the fatigue crack growth （FCG） behaviors of a new burn-resistant highly-stabilized beta Ti40 alloy. The FCG rates were analyzed. The fracture surfaces and the side surfaces of the test samples were explored. The results show that frequency affects the cracking behaviors of Ti40 alloy. Temperature also plays an important role in Ti40 alloy cracking. At room temperature （25°C）, when the frequency increases, the cracking rate changes a little in the range of low stress intensity factor （ΔK）, while it changes significantly when ΔK is high. At 500°C, the cracking rate of Ti40 alloy changes significantly during all the course of cracking. The frequency also affects the microstructure patterns of Ti40 alloy. A number of secondary cracks appear in the area more than 200 μm from the main crack at a high ΔK when the frequency is 1 Hz, but only a few secondary cracks exist when the frequency is 10 Hz. Facet image is the main image of the fracture surfaces when the frequency is 1 Hz. While, ductile striation occupies most of the area of fracture surfaces when the frequency is 10 Hz.
WU Huana, b, ZHAO Yongqinga, b, ZENG Weidonga, b, and QIAN Lib a School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China b Titanium Alloy Research Center, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China
摘 要：This article presents the fatigue crack growth （FCG） behaviors of a new burn-resistant highly-stabilized beta Ti40 alloy. The FCG rates were analyzed. The fracture surfaces and the side surfaces of the test samples were explored. The results show that frequency affects the cracking behaviors of Ti40 alloy. Temperature also plays an important role in Ti40 alloy cracking. At room temperature （25°C）, when the frequency increases, the cracking rate changes a little in the range of low stress intensity factor （ΔK）, while it changes significantly when ΔK is high. At 500°C, the cracking rate of Ti40 alloy changes significantly during all the course of cracking. The frequency also affects the microstructure patterns of Ti40 alloy. A number of secondary cracks appear in the area more than 200 μm from the main crack at a high ΔK when the frequency is 1 Hz, but only a few secondary cracks exist when the frequency is 10 Hz. Facet image is the main image of the fracture surfaces when the frequency is 1 Hz. While, ductile striation occupies most of the area of fracture surfaces when the frequency is 10 Hz.
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