Fatigue Crack Propagation Behavior of Ultrafine Grained Pure Titanium

doi:10.11901/1005.3093.2019.492

Chinese Journal of Materials Research

2020, Vol. 34

Issue (6): 417-424 DOI: 10.11901/1005.3093.2019.492

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Fatigue Crack Propagation Behavior of Ultrafine Grained Pure Titanium

LIU Xiaoyan(

), LIU Kuijun, YANG Xirong, WANG Jingzhong, LUO Lei

School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

Cite this article:

LIU Xiaoyan, LIU Kuijun, YANG Xirong, WANG Jingzhong, LUO Lei. Fatigue Crack Propagation Behavior of Ultrafine Grained Pure Titanium. Chinese Journal of Materials Research, 2020, 34(6): 417-424.

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Abstract

Four kinds of ultrafine grained (UFG) pure titanium were obtained by two-pass equal channel angular pressing (ECAP) at room temperature, ECAP+rotary swaging (RS) and ECAP+RS followed by annealing at 300℃ and 400℃ for 1 h, respectively. The fatigue crack growth tests of different UFG pure titanium were carried out, while their microstructure, the fatigue fracture morphology and the crack growth behavior were investigated by TEM and SEM. Results show that the microstructure has a significant effect on the threshold of fatigue crack growth rate and the near threshold zone of UFG pure titanium. The threshold values of fatigue crack growth rate for UFG pure titanium increase with the increase of strain, and decrease with the increase of annealing temperature after RS. The turning point occurs in the fatigue crack growth rate curve, which is affected by grain size and strength of UFG pure titanium. Before the turning point, UFG pure titanium produced by ECAP+RS has stronger resistance to fatigue crack growth than that produced only by ECAP, and the resistance to fatigue crack growth of UFG pure titanium after ECAP+RS decreases with the increase of annealing temperature. After the turning point, the fatigue crack growth rates of four kinds of UFG pure titanium are slightly different and the opposite result is presented. The threshold value before the turning point and the growth rate of the near threshold zone may play much important role in enhancing the resistance to the crack growth because the growth life of the crack of the near threshold zone before the turning point accounts for a very large part of the fatigue crack growth life.

Key words: metallic materials UFG pure titanium fatigue crack growth microstructure fatigue fracture

Received: 23 October 2019

ZTFLH:

TG146.2+3

Fund: National Natural Science Foundation of China(51474170);Special Project of Education Department(Z20190246)

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	Xiaoyan LIU
	Kuijun LIU
	Xirong YANG
	Jingzhong WANG
	Lei LUO

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.492 OR https://www.cjmr.org/EN/Y2020/V34/I6/417

Table 1 Chemical composition of pure titanium (%， mass fraction)

Fig.1 Geometry of specimen for crack propagation tests (unit: mm)

Fig.2 Microstructures of UFG pure titanium (a) ECAP; (b) ECAP+RS; (c) annealing at 300℃ after ECAP+RS; (d) annealing at 400℃ after ECAP+RS

Table 2 Mechanical properties of UFG pure titanium

Fig.3 Fatigue crack growth curves (a) ECAP and ECAP+RS; (b) ECAP+RS and annealing state; (c) summary of fatigue crack growth rates of four kinds of UFG pure titanium

Table 3 Parameter values of crack propagation in UFG pure titanium

Fig.4 Extended path and macroscopic fracture of UFG pure titanium (a) crack path; (b) macro fracture surface

Fig.5 Fracture morphology of UFG pure titanium (a, d, g, j) near threshold region; (b, e, h, k) stable growth region; (c, f, i, l) at ending stage. Note that (a~c) ECAP, (d~f) ECAP+RS, (g~i) 300℃, (j~l) 400℃

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