Surface modification of low-carbon nano-crystallite bainite via laser remelting and following isothermal transformation

Xing, Xiaolei; Zhou, Yefei; Yang, Yong; Gao, Shiyou; Ren, Xuejun; Yang, Qilin

doi:10.1016/j.apsusc.2015.06.109

Cited by 15 publications

(6 citation statements)

References 14 publications

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“…In general, the bainite is rich in carbon, has a high strength and toughness, and has a complex morphology [10]. Si as an alloying element, in bainite, is an element that suppresses a two-phase holding them precipitate cementite microstructure [30]. The transition of Si to iron is higher at high temperatures and the effect of Si is reduced due to the homogenization temperature which is not high enough in this sample [31,32].…”

Section: Investigation Of Phases Morphologymentioning

confidence: 99%

“…By adding elements C, Mn and Cr to the alloy, the starting temperature of the bainite can be reduced. At the same time, the stability of austenite can be increased [30]. Due to the high Mn ratio in the sample, it is not possible to say that bainite formation has occurred in all of the structure, because the remaining regions in the austenite phase are caused by the stabilizing feature of Mn in austenite.…”

Section: Investigation Of Phases Morphologymentioning

confidence: 99%

“…Bainite grows without any spread and is separated into the austenite immediately after the carbon conversion. In this case, dislocations in the austenite phase can be transformed into a bainite structure [30,[55][56][57]. Crystallography of phase transformation in lowcarbon alloys and the orientation relationship between austenite with bainite conform to the K-S relationship [58][59][60][61][62][63].…”

Section: Tem Observationsmentioning

confidence: 99%

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Microstructure Investigation of Thermally Induced Phase Transformation in Fe–Mn– Mo–Si Alloys

Armağan

Kırındı

2021

Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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In this study, structural and crystallographic properties of phase transformations in Fe-Mn-Mo-Si (Mn = 15.14 wt.% and 18.45 wt.%) alloys were investigated. The effects of heat treatment temperature on microstructure were investigated by Scanning Electron Microscopy (SEM) and Metallurgical Microscopy (MM). In addition to this, crystallographic properties of phase transformations were revealed by using Transmission Electron Microscopy (TEM) and X-Ray Diffraction (XRD) methods. In the samples subjected to heat treatment at 750 C, it was observed that bainite structure was formed in the alloy where Mn amount was low and ferrite structure in the alloy where Mn amount was higher. In addition, it was found that both alloys heat-treated at 900 C had the same microstructure (pearlite structure) in SEM and MM microscopy. At the same time, microstructure observations revealed that bainite and pearlite structures contain a mixture of ferrite and cementite. In the TEM studies it was revealed by electron diffraction pattern analyses that bainite and ferrite phase crystallized in b.c.c. structure and cementite phase in orthorhombic structure. → type transformation was observed for -bainite formation, and orientation relationship was found as (1 ̅ 11)  //(011)  , [101]  //[1 ̅ 11 ̅ ]  .

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Section: Investigation Of Phases Morphologymentioning

confidence: 99%

Section: Investigation Of Phases Morphologymentioning

confidence: 99%

Section: Tem Observationsmentioning

confidence: 99%

See 1 more Smart Citation

Microstructure Investigation of Thermally Induced Phase Transformation in Fe–Mn– Mo–Si Alloys

Armağan

Kırındı

2021

Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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“…Laser remelting (LR) is a new surface modification technique that emerged in recent decades with the development of high-power lasers. This technique has some inherent advantages, such as simple process, flexible operation, and economic efficiency, and is already used in conventional alloys, such as Fe [ 11 ], Al [ 12 ], Mg [ 13 ], and Ti [ 14 ]. Erdogan et al [ 15 ] studied the effect of LR on the surface structure and properties of electric current assistive sintered CoCrFeNiAl x Ti y HEAs.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Surface Properties of the Al0.65CoCrFeNi High-Entropy Alloy via Laser Remelting

Miao

et al. 2023

Materials

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The laser remelting technique was applied to the surface modification of the Al0.65CoCrFeNi high-entropy alloy (HEA) to further advance its mechanical potential. The microstructure of the remelted layer was refined from coarse dendritic to submicron-scale basket weave compared with the as-cast substrate, resulting in a 1.8-time increase in Vickers microhardness. The nanoindentation tests indicated that the nanohardness of the remelted layer was higher than that of each phase in the substrate. Meanwhile, the remelted layer retained considerable plasticity, as evidenced by its high Wp/Wt ratio (0.763) and strain hardening exponent (0.302). Additionally, adhesive wear prevailed on the substrate, while only abrasive wear features were observed on the remelted layer. Accordingly, the average friction coefficient and the wear rate of the remelted layer were minimized by 23% and 80%, respectively, compared with the substrate. Our findings explored an industrialized method to enhance the surface properties of the Al0.65CoCrFeNi HEA and also provided some helpful references for its laser additive manufacturing.

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“…Guo et al [13,14] improved the surface hardness of bainitic steel by different degrees through isothermal transformation at different temperatures after laser remelting. Xing et al [15][16][17] achieved a significant improvement of the surface hardness of bainitic steel by studying the influence of different laser scanning speeds on the modified layer. However, it is difficult to process the workpiece as a whole 2 of 12 due to the limitation of laser spot size.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Laser Remelting on the Microstructure and Performance of Bainitic Steel

Zhang

et al. 2019

Metals

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The surface of bainitic steel was remelted by fiber laser, and the microstructure and mechanical properties of the melted layer were studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM), a nanoindentation instrument, and wear equipment. The study of changing the laser scanning speed showed that the depth of the melted layer increases with decreases of the laser scanning speed. The wear-resistance property increased by 55% compared with the matrix and decreased with the reduction of laser scanning speed within a certain range. In the study of changing the laser-scanning space, the thermal effect of laser melting in the back channel on the front channel was further validated. At the same time, it was found that the solidified layer surface of hardness alternating with softness can be obtained by appropriately expanding the scanning space, which is conducive to improving the wear-resistant properties of the steel surface, and properly improving the production efficiency of the laser remelting treatment.

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Surface modification of low-carbon nano-crystallite bainite via laser remelting and following isothermal transformation

Cited by 15 publications

References 14 publications

Microstructure Investigation of Thermally Induced Phase Transformation in Fe–Mn– Mo–Si Alloys

Microstructure Investigation of Thermally Induced Phase Transformation in Fe–Mn– Mo–Si Alloys

Enhanced Surface Properties of the Al0.65CoCrFeNi High-Entropy Alloy via Laser Remelting

The Effects of Laser Remelting on the Microstructure and Performance of Bainitic Steel

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