Study on the softening in overlapping zone by laser-overlapping scanning surface hardening for carbon and alloyed steel

Yao, Chengwu; Xu, Binshi; Huang, Jian; Zhang, Peilei; Wu, Yixiong

doi:10.1016/j.optlaseng.2009.05.001

Cited by 53 publications

(16 citation statements)

References 10 publications

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“…At the same time, the application of the high-tech 2D scanning optics [7,8] and 3D scanning optics [6,9] result in an increase in the laser spot size of more than 50 mm. In most cases, it allows avoiding the overlapping of the laser beam, which caused the heterogeneous hardness in the subsurface layers of AISI S7 tool steel [4], AISI T1 tool steel [10], and AISI 1045 carbon steel [10,11] via the tempered martensitic structure formation in the overlapping area of the laser beam.…”

Section: Literature Reviewmentioning

confidence: 99%

Comparison of Effects of Laser, Ultrasonic, and Combined Laser-Ultrasonic Hardening Treatments on Surface Properties of AISI 1045 Steel Parts

Lesyk

Alnusirat

Martı́nez

et al. 2021

Lecture Notes in Mechanical Engineering

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An ultrasonic impact treatment (UIT) in combination with laser heat treatment (LHT) is proposed to improve surface roughness and enhance the subsurface grain refinement and residual stress of hypoeutectoid steel. The LHT treatment was conducted using a fiber laser with 2D scanning optics. The UIT treatment was performed using a multi-pin ultrasonic tool. The surface texture, roughness parameters, and surface hardness of the UIT, LHT, UIT+LHT, and LHT+UIT hardened samples were studied and compared. The surface roughness and hardness were under special attention as possible key factors to additional optimization of the UTI duration. The results indicated that the combined UIT +LHT technique could be applied to get both significant surface hardness and hardening depth in AISI 1045 medium carbon steel. The combined LHT-UIT hardened specimens exhibited the lowest surface roughness and highest surface hardness, which was attributed to the surface attributed to the surface relief and ultrafine-grained martensitic structure in the subsurface formation.

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Section: Literature Reviewmentioning

confidence: 99%

Comparison of Effects of Laser, Ultrasonic, and Combined Laser-Ultrasonic Hardening Treatments on Surface Properties of AISI 1045 Steel Parts

Lesyk

Alnusirat

Martı́nez

et al. 2021

Lecture Notes in Mechanical Engineering

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“…Consequently, it is possible that further surface treatment of this type of material, such as laser-assisted heat treatment, would negatively affect the optimized microstructure of the base metal. Yao et al reported local softening behavior of the surface within the overlapping zone after multipass laser-assisted heat treatment of medium carbon with alloyed steels, which did not involve Cu-bearing steel [32]. Moreover, although Bouquet et al [33] and Kwok et al [34] reported the surface heat treatment results of plastic mold steels, relevant fundamental studies on local softening behavior based on microstructural characterization have not been reported for Cu-bearing plastic mold steels, such as AISI P21.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization of Surface Softening Behavior for Cu-Bearing Martensitic Steels after Laser Surface Heat Treatment

Chun

Sim

Kim

et al. 2018

Metals

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Abstract:The surface hardening and softening behavior of two types of medium carbon martensitic steel (AISI P20-improved and AISI P21) after laser-assisted heat treatment was quantitatively compared. The laser-assisted heat treatment was performed using a high-power diode laser with in situ temperature and laser power control (two-color pyrometer system). For AISI P20-improved steel, the peak hardness value within the hardening zone was approximately 640 HV after laser-assisted heat treatment at a temperature of 1473 K. In other words, the hardness increased by 120% from the base metal level (290 HV). However, for AISI P21 steel, the hardness within the heat-treated zone did not change from that of the base metal (410 HV), despite being accompanied by martensite transformation. Moreover, it was clearly observed that the hardness dropped below the level of the base metal at the boundary between the heat-treated zone and the base metal region, forming a softening zone. This softening behavior was strongly related to coarsening and a looser distribution of Cu precipitates compared with that of the base metal region, despite the same matrix phase (i.e., tempered martensite) existing in the softening zone and in the base metal region.

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“…In industrial processes like laser or electron beam welding, laser flash hardening, adiabatic shearing and in operating environments such as wheel-rail contact in railway traffic, the material is sometimes subjected to rapid heating and cooling within a localised volume [1][2][3][4][5][6]. Such local heating often has a short duration and is normally followed by self-cooling with large cooling rates.…”

Section: Introductionmentioning

confidence: 99%

Influence of short heat pulses on properties of martensite in medium carbon steels

Cvetkovski

Ahlström

Karlsson

2013

Materials Science and Engineering: A

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Study on the softening in overlapping zone by laser-overlapping scanning surface hardening for carbon and alloyed steel

Cited by 53 publications

References 10 publications

Comparison of Effects of Laser, Ultrasonic, and Combined Laser-Ultrasonic Hardening Treatments on Surface Properties of AISI 1045 Steel Parts

Comparison of Effects of Laser, Ultrasonic, and Combined Laser-Ultrasonic Hardening Treatments on Surface Properties of AISI 1045 Steel Parts

Microstructural Characterization of Surface Softening Behavior for Cu-Bearing Martensitic Steels after Laser Surface Heat Treatment

Influence of short heat pulses on properties of martensite in medium carbon steels

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