Microstructural changes of Zr702 induced by pulsed laser surface treatment

Chai, Linjiang; Chen, Baofeng; Wang, Shuyan; Guo, Ning; Huang, Chen Hung; Zhou, Zhiming; Huang, Weijiu

doi:10.1016/j.apsusc.2015.12.105

Cited by 40 publications

(7 citation statements)

References 41 publications

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“…Obviously, the increment of hardness caused by micro-nano twins was larger than that from dislocations, which indicated that micro-nano twins had a positive effect on increasing the hardness of the alloy. A similar effect was also verified in Zr702, where micro-nano twins formed at the surface of the material after a pulsed laser surface treatment [36]. Liu et al [11] prepared a gradient structure in a Ti-6Al-4 V alloy using the metal shot peening method.…”

Section: Effect Of Grain Size On Formation Of Micro-nano Twinsmentioning

confidence: 60%

“…It has been proven that both grain size and refined structures (dislocations and twins) affect the hardness of metals because both interfaces (grain boundary and twin boundary) and dislocations act as strong obstacles to block the movement of dislocations [11,36]. In this study, the grain size at the subsurface was approximately equal to that in the matrix.…”

Section: Effect Of Grain Size On Formation Of Micro-nano Twinsmentioning

confidence: 69%

“…where H D D and H T D are increments of hardness caused by dislocations and twins, respectively. According to the empirical equation [36]:…”

Section: Effect Of Grain Size On Formation Of Micro-nano Twinsmentioning

confidence: 99%

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Micro-nano twins appearing in ultrafine-grained Ti–6Al–4 V alloy induced by high-pressure water jet technology

Sun¹,

Hu²,

Jiang³

et al. 2022

Mater. Res. Express

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In this study, the surface of an ultrafine-grained Ti–6Al–4V alloy was treated with high-pressure water jet technology (HPWJT). Then, the microstructure of the alloy was investigated using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). Three obviously different microstructural characteristics were observed from the treated surface to the matrix: ultrafine equiaxed grains with diameters from hundreds of nanometers to a few micrometers, micro-nano twins inside ultrafine equiaxed α grains, and an initial undeformed microstructure with ultrafine equiaxed grains. Formation of micro-nano twins in the subsurface was related to the special misorientation angle of neighboring grains. We proved the dependence of twinning on the crystallographic orientation and grain size of the α phase. In addition, the quantitative contributions of the micro-nano twins to the surface hardness of the alloy were calculated; micro-nano twins significantly improved the surface hardness of the alloy. This study provides a new easy method for introducing micro-nano twins on the surfaces of Ti and its alloys, and it may further improve the mechanical properties of these alloys.

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Section: Effect Of Grain Size On Formation Of Micro-nano Twinsmentioning

confidence: 60%

Section: Effect Of Grain Size On Formation Of Micro-nano Twinsmentioning

confidence: 69%

See 1 more Smart Citation

Micro-nano twins appearing in ultrafine-grained Ti–6Al–4 V alloy induced by high-pressure water jet technology

Sun¹,

Hu²,

Jiang³

et al. 2022

Mater. Res. Express

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show abstract

“…In addition, during PLP short laser bursts with high intensity heats a small surface volume, and the rest of the part behaves as a global heat sink, which leads to extremely rapid heating and cooling rates that are difficult to be measured by the current state-of-the-art thermal monitoring. Nevertheless, laser-induced microstructural changes are investigated on different material systems [24] [25][26][27][28]. The results show that the processed area is divided into three regions: a laser MZ, a HAZ and unaffected base material [25,26,28]; the hardness is improved after laser processing [24,27].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, laser-induced microstructural changes are investigated on different material systems [24] [25][26][27][28]. The results show that the processed area is divided into three regions: a laser MZ, a HAZ and unaffected base material [25,26,28]; the hardness is improved after laser processing [24,27]. In these works, the laser pulse durations are longer (~milli-seconds) than in the PLP; and pulse radii are several millimeters.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and wear resistance of Ti6Al4V surfaces processed by pulsed laser

Chen

Usta

Eriten

2017

Surface and Coatings Technology

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When pulsed laser beams deposit spatially and temporally localized power on the metallic surfaces, microstructure and mechanical properties could change significantly. During and after each pulse, the exposed surface experiences a cycle of thermal processes involving extremely high heating and cooling rates, which consequently cause significant microstructure evolution. Changes in mechanical strength follow such microstructural changes. In this work, the influence of pulsed laser processing (PLP) on microstructural evolution, resulting hardness and wear resistance of Ti6Al4V surfaces is investigated. Average pulse power is varied from surface heating to melting regimes in processing. A 2D axisymmetric finite element model of a single pulse is utilized to obtain the heating and cooling histories, and a phase transformation mapping procedure is used to obtain the microstructural evolution. Melting (MZ) and heat affected zones (HAZ) observed at the cross sections of the processed surfaces are found to correlate with the predicted temperature field. The resulting phases in those zones are predominantly martensitic α' and α phase; higher laser power produces thicker martensitic α' surface layers several microns into the processed surface. Nanoindentation, nano/microscale and mesoscale wear tests are then applied to the processed surfaces to identify the effects of microstructure on hardness and wear resistance. The surface processed by higher laser power shows higher hardness and wear resistance compared to the surface processed by low power laser. The hardness and wear resistance of the surface processed by low power laser shows no obvious change from substrate material. Mixture of hard martensitic surface layer and underlying ductile substrate resulting from PLP facilitate superior resistance to abrasive and partly low cycle fatigue wear.

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Bimodal plate structures induced by pulsed laser in duplex-phase Zr alloy

Chai

Wang

et al. 2017

Sci. China Technol. Sci.

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Microstructural changes of Zr702 induced by pulsed laser surface treatment

Cited by 40 publications

References 41 publications

Micro-nano twins appearing in ultrafine-grained Ti–6Al–4 V alloy induced by high-pressure water jet technology

Micro-nano twins appearing in ultrafine-grained Ti–6Al–4 V alloy induced by high-pressure water jet technology

Microstructure and wear resistance of Ti6Al4V surfaces processed by pulsed laser

Bimodal plate structures induced by pulsed laser in duplex-phase Zr alloy

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