The characteristics of treated zone processed by pulsed Nd-YAG laser surface remelting on hot work steel

Zhang, Zhihui; Lin, Pengyu; Cong, Dalong; Kong, Shuhua; Zhou, Hong; Liu, Ren

doi:10.1016/j.optlastec.2014.05.015

Cited by 21 publications

(4 citation statements)

References 32 publications

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“…Many research papers have focused on this solution relative to die fatigue wear. Zhang et al [8] found that the average peak power density and effective peak power density have significant impacts on the size and morphology of the unit. When the effective peak power density was 595-1448 W/mm 2 , a coupling bionic unit with higher hardness was obtained.…”

Section: Introductionmentioning

confidence: 99%

Improved localized fatigue wear resistance of large forging tools using a combination of multiple coupled bionic models

Zhi

Zhou

et al. 2019

SN Appl. Sci.

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It is important to solve the partial fatigue wear of large forging dies, where the service life can be short. The purpose of this paper is to use laser remelting biomimetic technology to prepare a coupling biomimetic model combination on the mold surface, strengthen the local fatigue wear resistance of the mold, and extend the service life of the mold. Three types of laser energies were used to prepare the coupling biomimetic elements and analyze the microstructure and phase composition of the specific gravity melting zone. The biomimetic units were combined into a variety of coupling biomimetic models (fringe, mesh, and dense array models with different laser energies), and the number of fatigue cracks and the weight of wear loss of the coupling biomimetic model were compared at different temperatures. The mechanism of the coupling bionic model was analyzed, and the coupling bionic surface with a dense row structure was determined to have strong anti-fatigue wear performance. According to the Range Method, the relationship between wear and fatigue temperature and laser energy of the coupled bionic model was determined. Using DEFORM software to simulate the stress, temperature, and wear conditions of the front axle die surface, different coupling biomimetic model combinations were prepared on the abrasive surface. The die wear and cut edge width of the forgings were reduced after practical production, which proved that the laser bionic local strengthening method can effectively prolong the service life of a die.

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Section: Introductionmentioning

confidence: 99%

Improved localized fatigue wear resistance of large forging tools using a combination of multiple coupled bionic models

Zhi

Zhou

et al. 2019

SN Appl. Sci.

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“…SM45C, medium carbon steel, is widely used in industrial field for the production of machine parts such as crank and gear as well as the material of cold-work die steel. However, there can be damage such as abrasion easily when it is used for forming or cutting of advanced high strength steels which is currently increasing in use though it is used after surface hardening process on the material through surface preparation such as heat treatment 1,2) . To improve this problem, surface modification such as chemical vapor deposition (CVD), physical vapor deposition (PVD) has been applied [3][4][5] , however, the separation phenomenon has been frequently reported due to thin hardened layer depth and brittleness 6) .…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Hardness of Surface Melting Hardened Zone of Mold Steel, SM45C using Yb:YAG Disk Laser

Lee

Choi

Yoon

et al. 2016

Journal of Welding and Joining

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This study applied laser surface melting process using CW(Continuous wave) Yb:YAG laser and cold-work die steel SM45C and investigated microstructure and hardness. Laser beam speed, power and beam interval are fixed at 70 mm/sec, 2.8 kW and 800 ㎛ respectively. Depth of Hardening layer(Melting zone) was a minimum of 0.8 mm and a maximum of 1.0 mm that exceeds the limit of minimum depth 0.5 mm applying trimming die. In all weld zone, macrostructure was dendrite structure. At the dendrite boundary, Mn, Al, S and O was segregated and MnS and Al oxide existed. However, this inclusion didn't observe in the heat-affected zone (HAZ). As a result of interpreting phase transformation of binary diagram, MnS crystallizes from liquid. Also, it estimated that Al oxide forms by reacting with oxygen in the atmosphere. The hardness of the melting zone was from 650 Hv to 660 Hv regardless of the location that higher 60 Hv than the hardness of the HAZ that had maximum 600 Hv. In comparison with the size of microstructure using electron backscatter diffraction(EBSD), the size of microstructure in the melting zone was smaller than HAZ. Because it estimated that cooling rate of laser surface melting process is faster than water quenching.

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“…The application of a laser beam, plasma stream, or electric arc results in the operation of formation of the material surface layer being accompanied by rapid crystallization, which means that the structure of the remelted material is formed in conditions of a high temperature gradient, and a very short duration of solidification. The changes in both the structure and the morphology of phases triggered this way may lead to creating a material with a new spectrum of properties [1][2][3][4][5][6][7][8][9][10][11]. Modification of magnesium alloys surface layer is an interesting research issue of a high application potential [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Structural Aspects of Remelting of the AZ91 Magnesium Alloy Surface Layer

Iwaszko

Strzelecka²

2016

Archives of Foundry Engineering

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In this study, modification of the AZ91 magnesium alloy surface layer with a CO 2 continuous wave operation laser has been taken on. The extent and character of structural changes generated in the surface layer of the material was being assessed on the basis of both macro-and microscopy investigations, and the EDX analysis. Considerable changes in the structure of the AZ91 alloy surface layer and the morphology of phases have been found. The remelting processing was accompanied by a strong refinement of the structure and a more uniform distribution of individual phases. The conducted investigations showed that the remelting zone dimensions are a result of the process parameters, and that they can be controlled by an appropriate combination of basic remelting parameters, i.e. the laser power, the distance from the sample surface, and the scanning rate. The investigations and the obtained results revealed the possibility of an effective modification of the AZ91 magnesium alloy surface layer in the process of remelting carried out with a CO 2 laser beam.

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The characteristics of treated zone processed by pulsed Nd-YAG laser surface remelting on hot work steel

Cited by 21 publications

References 32 publications

Improved localized fatigue wear resistance of large forging tools using a combination of multiple coupled bionic models

Improved localized fatigue wear resistance of large forging tools using a combination of multiple coupled bionic models

Microstructure and Hardness of Surface Melting Hardened Zone of Mold Steel, SM45C using Yb:YAG Disk Laser

Structural Aspects of Remelting of the AZ91 Magnesium Alloy Surface Layer

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