Effect of overlap pass tempering on hardness and fatigue behaviour in laser heat treatment of carbon steel

Iino, Y.; Shimoda, Kenji

doi:10.1007/bf01729179

Cited by 29 publications

(10 citation statements)

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“…As a result, the interacted region (tempered region) was transformed to tempered martensite. Giorleo et al [29] reported this phenomenon as back-tempering, which leads to a reduction in hardness [30].…”

Section: Microstructurementioning

confidence: 97%

Effect of Multiple-Pass Friction Stir Processing on Hardness and Corrosion Resistance of Martensitic Stainless Steel

Pan¹,

Kwok²,

Lo³

2019

Coatings

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In the present study, the influence of multi-pass friction stir processing (FSP) of AISI 420 martensitic stainless steel on the microstructure, hardness, and corrosion behavior was investigated. Similar to single-pass FSPed 420, the multi-pass FSPed specimens with different overlapping ratios incurred microstructural change at the center and retreating side of the second track with martensite, retained austenite, and chromium carbides. Overlapping of the two successive tracks in the multi-pass FSPed 420 led to back-tempering and a local drop in hardness at the advancing side of the second track. The precipitation of chromium carbides in the tempered regions of the multi-pass FSPed specimens became the active sites for preferential corrosion attack in the 3.5 wt.% NaCl solution at 25 °C.

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Section: Microstructurementioning

confidence: 97%

Effect of Multiple-Pass Friction Stir Processing on Hardness and Corrosion Resistance of Martensitic Stainless Steel

Pan¹,

Kwok²,

Lo³

2019

Coatings

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“…Owing to the limited size of the laser beam, just a restricted space is dealt with using a single laser scanning, and thus multiple overlapping laser tracks is indispensable when a large area required to be treated [11,12]. However, multiple passes with overlapping laser tracks is harmful due to the formation of soft zones induced by tempering effect or cracks in the overlapped region [13]. Van Brussel et al stated that the stress profile in multiple overlapping laser tracks was determined by laser processing and the materials being treated.…”

Section: Introductionmentioning

confidence: 99%

Investigation on rolling sliding wear behavior of wheel steel by laser dispersed treatment

Li¹,

Xing²,

Yang³

et al. 2014

Wear

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a b s t r a c tTo improve wear resistance of wheel steels under rolling-sliding wear conditions, a novel technique named laser dispersed treatment (LDT) was used by forming a regular scattered hardening pattern distributed on the surface of wheel disc, which can avoid soft zones induced by tempering effect or cracks in the overlapped region. The wear rate of LDT wheel disc was evaluated by twin-disc wear testing machine in comparison with the untreated disc. The microstructure of LDT wheel disc and untreated disc was characterized by optical microscopy (OM), X-ray diffraction (XRD) and scanning electron microscopy (SEM). This study focuses on the relationship between the of microstructure and wear resistance of laser treated zone. It is shown that a higher wear resistance of laser treated zone is attributed to the strain strengthen of retained austenite during wearing and the compressive stress within laser treated zone. The laser dispersed treatment on wheel may be a useful technique to improve the wear resistance of wheel without harmful influence on rail.

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“…The enabler to enhance all of these factors is the temperature field [14] that is caused by the intensity distribution of the laser as well as the feed rate, spot size and temperature regulation. A lot of research has been done to predict the outcome of these parameters by simulation [12,[15][16][17]. Kunc et al [18], for example, predicted multitrack hardening of the investigated 42CrMo4 (AISI 4140).…”

Section: Introductionmentioning

confidence: 99%

“…The optimization of the microstructure as well as the thermal stresses [3,11] and the deformation are still ongoing investigations. Also the reduction of the tempering effect that appears when several hardening tracks are placed next to each other is a main challenge [8,12,13]. The enabler to enhance all of these factors is the temperature field [14] that is caused by the intensity distribution of the laser as well as the feed rate, spot size and temperature regulation.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Laser Hardening Process by Adapting the Intensity Distribution to Generate a Top-hat Temperature Distribution Using Freeform Optics

2017

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Laser hardening is a surface hardening process which enables high quality results due to the controllability of the energy input. The hardened area is determined by the heat distribution caused by the intensity profile of the laser beam. However, commonly used top-hat laser beams do not provide an ideal temperature profile. Therefore, in this paper the beam profile, and thus the temperature profile, is optimized using freeform optics. The intensity distribution is modified to generate a top-hat temperature profile on the surface. The results of laser hardening with the optimized distribution are thereupon compared with results using a top-hat intensity distribution.

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Effect of overlap pass tempering on hardness and fatigue behaviour in laser heat treatment of carbon steel

Cited by 29 publications

References 0 publications

Effect of Multiple-Pass Friction Stir Processing on Hardness and Corrosion Resistance of Martensitic Stainless Steel

Effect of Multiple-Pass Friction Stir Processing on Hardness and Corrosion Resistance of Martensitic Stainless Steel

Investigation on rolling sliding wear behavior of wheel steel by laser dispersed treatment

Optimization of the Laser Hardening Process by Adapting the Intensity Distribution to Generate a Top-hat Temperature Distribution Using Freeform Optics

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