Selective area carburizing of low carbon steel using an Nd: YAG laser

Tayal, M.; Mukherjee, K.

doi:10.1016/0921-5093(94)91093-6

Cited by 21 publications

(11 citation statements)

References 4 publications

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“…As such, the lower power scans had a smaller melt depth and the carbon was more concentrated, resulting in higher carbon concentrations. As with Tayal and Mukherjee, 54 Walker et al 52 The eutectic and hypereutectic structures were also obtained by Müller et al, 51 Figure 42.…”

Section: Laser Carburizing Of Steelsupporting

confidence: 68%

“…Other hypoeutectic microstructures obtained included primary austenitic dendrites with interdendritic eutectic. 52,43,12,54 Walker et al 52 obtained a dendritic arm spacing of 2 and 3 µm for the iron and steel base metal experiments, respectively. This yielded a hardness of 650 HV, but required quenching in liquid nitrogen to achieve this.…”

Section: Laser Carburizing Of Steelmentioning

confidence: 98%

“…X-ray analysis by Zheng and Zhang detected ferrite, austenite, and multiple carbides of Fe x C (x=1, 2, or 3). Tayal and Mukherjee 54 obtained both the dendritic structure and a cellular structure, Figure 44a,b. These authors varied the laser power from 1.06 kW/cm 2 to 10.6 kW/cm and obtained these structures, as well as a eutectic structure and a hypereutectic structure, Figure 44c,d.…”

Section: Laser Carburizing Of Steelmentioning

confidence: 99%

“…Multiple authors 43,[51][52][53][54][55][56]58 have tested laser carburizing of steel, with resulting carbon contents of near-eutectoid, to hypoeutectic, to hypereutectic. A summary of the different papers and the hardness values obtained is shown in Table 6.…”

Section: Laser Carburizing Of Steelmentioning

confidence: 99%

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Novel surface modification of steel using high-density infrared heating

Haase¹

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High-density infrared heating is a surface heating technique capable of producing wearresistant coatings over a considerably larger processing area than currently available techniques (e.g. lasers). High-density infrared heating from a plasma arc-lamp is typically used for thermal annealing of silicon wafers, but this project expands the use of the plasma arc-lamp to produce carbon-enriched wear-resistant coatings on steel substrates. The focus of this study was to establish plasma arc-lamp processing parameters for the production of such coatings on a 1018 steel. The phase transformations involved were found to be in accordance with what occur in a fast-cooled hypoeutectic Fe-C system. The resulting structures contained a significant amount of Fe 3 C near the surface present as discrete plates and with the ledeburite (i.e., eutectic microconstituent). A large fraction of carbide and the fine scale of the structures resulted in high hardnesses, reaching 750 HV 0.1 and 980 HV 0.1 for the graphite-only and Fe-Mo-C surface-modified regions, respectively. The high hardness and carbide fraction resulted in a significant improvement in two-body sliding wear-resistance over a standard carburized-and-hardened microstructure.

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Section: Laser Carburizing Of Steelsupporting

confidence: 68%

Section: Laser Carburizing Of Steelmentioning

confidence: 98%

Section: Laser Carburizing Of Steelmentioning

confidence: 99%

Section: Laser Carburizing Of Steelmentioning

confidence: 99%

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Novel surface modification of steel using high-density infrared heating

Haase¹

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“…Because the surface properties of many structural materials can be modified by laser surface treatments, 14 –16 laser transformation hardening has been applied to many steels to improve their fatigue properties 17 –19 . In the present investigation, T‐250 maraging steel was subjected to a laser surface‐annealing (LSA) treatment.…”

Section: Introductionmentioning

confidence: 99%

Reduction of hydrogen embrittlement in an ultra‐high‐strength steel by laser surface annealing

Tsay

Yang

2000

Fatigue Fract Eng Mat Struct

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This paper shows that laser beam irradiation improves the resistance to hydrogen embrittlement (HE) in an ultra‐high‐strength maraging steel. Localized laser irradiation of a peak‐aged steel plate resulted in the formation of a soft surface layer called the laser‐annealed zone (LAZ). A composite region (CR) was formed when both the top and bottom surfaces of a peak‐aged specimen were laser‐annealed (LA) to leave an interior layer of untransformed base metal (BM) sandwiched between the two LAZs. Slow strain rate tensile tests showed that LA specimens had lower strength and ductility than the peak‐aged specimens when tested in air, but in a H2 S solution, the soft LAZs showed less susceptibility to HE than the BM. The fatigue crack growth rates (FCGRs) in the CR were lower than those in the BM regardless of testing environment and stress ratio (R ). The retarded crack growth in the CR was attributed to the combination of residual compressive stresses and the soft microstructures in the LAZs. The tensile fracture appearance of LA specimens tested in a H2 S solution exhibited intergranular fracture in the BM. Fractographs of the fatigue specimens tested in gaseous hydrogen revealed transgranular fracture in the LAZs and mainly quasi‐cleavage fracture in the BM.

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TiB2-reinforced composite coating by gas tungsten arc welding

Yılmaz

Özenbaş

2009

J Mater Sci

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Selective area carburizing of low carbon steel using an Nd: YAG laser

Cited by 21 publications

References 4 publications

Novel surface modification of steel using high-density infrared heating

Novel surface modification of steel using high-density infrared heating

Reduction of hydrogen embrittlement in an ultra‐high‐strength steel by laser surface annealing

TiB2-reinforced composite coating by gas tungsten arc welding

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