Improved fatigue properties of ultrafine-grained copper under cyclic torsion loading

Li, R.H.; Zhang, Z.J.; Zhang, P.

doi:10.1016/j.actamat.2013.06.032

Cited by 52 publications

(31 citation statements)

References 49 publications

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“…They found the fatigue limit depended on tensile strength with a fatigue ratio (r f /r u ) within 0.34À0.4 for CG samples and $0.4 for nanostructured samples produced by ECAP. Nevertheless, although the fatigue strengths also increased with tensile strength, the fatigue ratios were found to decrease in some pure metals and alloys strengthened by SPD [4,44,45]. For example, the fatigue ratios of CG pure Cu and Cu alloys are typically larger than 0.35, while they decrease to $0.25 with increasing strength in UFG/NC Cu and Cu alloys produced by ECAP [44].…”

Section: Fatigue Propertiesmentioning

confidence: 87%

“…Considerable enhancements in fatigue properties have been observed in ultrafine-grained (UFG) or nanostructured materials fabricated by means of severe plastic deformation (SPD) or electrodeposition [1][2][3][4][5][6]. However, the enhancements were found to be mostly under stress-controlled cyclic loading with a low strain amplitude, while the fatigue lifetime under cyclic loading with an intermediate to high strain amplitude or under strain-controlled mode usually decreases [1].…”

Section: Introductionmentioning

confidence: 99%

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Fatigue behaviors of AISI 316L stainless steel with a gradient nanostructured surface layer

et al. 2015

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Section: Fatigue Propertiesmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Fatigue behaviors of AISI 316L stainless steel with a gradient nanostructured surface layer

et al. 2015

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“…Therefore, the exponent b reflects the fatigue damage degree during cyclic deformation to some extent. [23,24] It can be seen from Figure 4(a) that, for the material with the same r f ¢, increasing the value of b can enhance the fatigue strength; and for the material with the same b, increasing the value of r f ¢ will lead to the same results. [23,24] As the values of r f ¢ and b are closely related to the true fracture strength and fatigue damage degree, respectively, improving the tensile strength and inhibiting the fatigue damage are two effective procedures to enhance the final fatigue strength.…”

mentioning

confidence: 67%

“…[23,24] It can be seen from Figure 4(a) that, for the material with the same r f ¢, increasing the value of b can enhance the fatigue strength; and for the material with the same b, increasing the value of r f ¢ will lead to the same results. [23,24] As the values of r f ¢ and b are closely related to the true fracture strength and fatigue damage degree, respectively, improving the tensile strength and inhibiting the fatigue damage are two effective procedures to enhance the final fatigue strength. [23][24][25][26] Through pre-straining of the Fe- 30Mn-0.9C TWIP steel in this study, it is found that the tensile strength remains unchanged (Figure 1(c)), so as discussed above, the fatigue strength coefficient r f ¢ should also remain the same after pre-straining.…”

mentioning

confidence: 67%

“…[23,24] As the values of r f ¢ and b are closely related to the true fracture strength and fatigue damage degree, respectively, improving the tensile strength and inhibiting the fatigue damage are two effective procedures to enhance the final fatigue strength. [23][24][25][26] Through pre-straining of the Fe- 30Mn-0.9C TWIP steel in this study, it is found that the tensile strength remains unchanged (Figure 1(c)), so as discussed above, the fatigue strength coefficient r f ¢ should also remain the same after pre-straining. [22] Therefore, the improvement in the fatigue lives of the TWIP steel after pre-straining should be primarily owing to the increase of b, as schematically illustrated by Figure 4(b).…”

mentioning

confidence: 99%

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Improving the High-Cycle Fatigue Lives of Fe-30Mn-0.9C Twinning-Induced Plasticity Steel Through Pre-straining

Wang

Zhang

Shao

et al. 2015

Metall Mater Trans A

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The tensile properties, high-cycle fatigue properties, and microstructure evolutions during fatigue process of asreceived and pre-strained Fe-30Mn-0.9C twinning-induced plasticity (TWIP) steel were investigated. It is found that the fatigue lives of the TWIP steel can be effectively improved through pre-straining, since the deformation twins induced by pre-straining could effectively lead to the improved yield strength and the homogenized deformation. This study may provide possible ways for improving the high-cycle fatigue properties of TWIP steels.In recent years, the advanced high-strength steels have been widely used in automobile industry to satisfy the weight reducing, energy saving, and security principles of new generation cars. [1] Twinning-induced plasticity (TWIP) steels have an excellent combination of high strength and good ductility, so that they are very attractive for automotive industry; therefore, much attention has been paid on the development of TWIP steels. So far, researchers mainly focus on the alloy designing, basic mechanical properties, and the corresponding microstructure evolution during deformation of TWIP steels. [2][3][4][5][6][7][8][9][10] Generally, most automobile parts are under cyclic loading condition during their service, thus, the fatigue resistance is one of the key factors for the practical utilization of TWIP steels. There are many reports about the low-cycle fatigue properties of TWIP steels, [11][12][13][14][15][16] and the pre-strain method was developed to improve their low-cycle fatigue properties. [11,16] As for the high-cycle fatigue, there have been some investigations about the bending fatigue properties of TWIP steels. [17][18][19][20] Hamada et al. [17][18][19] and Karjalainen et al. [20] showed that TWIP steels have quite high bending fatigue strength. However, there are no research findings on the high-cycle fatigue properties of the TWIP steels under axial loading, and the effects of pre-strain on the high-cycle fatigue properties are still not clear so far.In order to improve the fundamental understanding on the axial high-cycle fatigue behaviors of TWIP steels and supplement experimental data, the axial high-cycle fatigue tests of as-received and pre-strained Fe-30Mn-0.9C TWIP steel were performed and the corresponding microstructure evolutions were observed in the current study. The main goal of the current study is to explore further improvement of the high-cycle fatigue properties of TWIP steel via pre-straining.In this study, Fe-30Mn-0.9C (wt pct) TWIP steel was used. The cast ingot was austenized at 1473 K (1200°C) for 4 h, then immediately hot forged into plate with final dimension of 40 9 100 mm 2 at 1223 K to 1473 K (950°C to 1200°C), and finally cooled in air. The plate was annealed at 1323 K (1050°C) for 1 hour and water-quenched, and then dog-bone shaped tensile and fatigue specimens were cut into sectional dimensions of 15 9 3 9 3 and 10 9 5 9 4 mm 3 from the annealed plate, respectively; and the length direction of tensile and fatigue specimen...

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Biaxial fatigue property enhancement of gradient ultra-fine-grained Zircaloy-4 prepared by surface mechanical rolling treatment

et al. 2018

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Improved fatigue properties of ultrafine-grained copper under cyclic torsion loading

Cited by 52 publications

References 49 publications

Fatigue behaviors of AISI 316L stainless steel with a gradient nanostructured surface layer

Fatigue behaviors of AISI 316L stainless steel with a gradient nanostructured surface layer

Improving the High-Cycle Fatigue Lives of Fe-30Mn-0.9C Twinning-Induced Plasticity Steel Through Pre-straining

Biaxial fatigue property enhancement of gradient ultra-fine-grained Zircaloy-4 prepared by surface mechanical rolling treatment

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