Effect of Laser Hardening on Die Steel Microhardness and Surface Quality

Aborkin, A. V.; Vaganov, V. E.; Shlegel, A. N.; Букарев, И. М.

doi:10.1007/s11015-015-0148-8

Cited by 17 publications

(4 citation statements)

References 3 publications

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“…Taking into account the high technical and economic efficiency of the use of laser quenching for ejectors and punches, it is planned to apply the developed approach for another die for hot deformation [26][27][28][29][30].…”

Section: Discussionmentioning

confidence: 99%

Improving the Thermal Fatigue Strength of Hot-Working Tools by Laser Treatment

Chichenev

2022

Materials Research Proceedings

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Abstract. A method for increasing the thermal fatigue strength of a tool used in hot forming of bearing rings by applying circular laser tracks to the working surfaces is considered. Laser treatment is carried out with a power of 2.0...2.5 kW by applying on the end face working surface of the tool in the direction from the center to the periphery of the circular tracks with a common center coinciding with the center of the circumference of the end face; the tool is rotated at a constant angular rate, the spot diameter ds for each track is selected according to the dependence ds,i+1/ds,i = 0.85...0.90, and the laser radiation spots of adjacent tracks have a common point of contact. The results of pilot testing are presented, which confirmed the high technical and economic efficiency of the use of laser quenching for ejectors and punches. A tool made by machining, for example, an ejector of an AMP-70 automatic press, is subjected to volume quenching and tempering. The ejector material was steel 3Kh3M3F, quenching temperature in oil – 1030...1050 °С, tempering temperature – 580...610 °С. After volume quenching, additional machining is carried out, usually grinding, in order to remove the decarbonized layer of material formed during heat treatment and to give the working surface the required roughness class. The final stage in the tool manufacturing is the quenching of its working surface by laser treatment. Pilot testing showed that the use of laser treatment made it possible to increase the durability of ejectors of various types by 2 ... 3 times, of deforming punches – by 2.2 times.

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Section: Discussionmentioning

confidence: 99%

Improving the Thermal Fatigue Strength of Hot-Working Tools by Laser Treatment

Chichenev

2022

Materials Research Proceedings

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“…As soon as dimensionless factors, containing thermophysical characteristics of die tool material, were used during planning of the experiment, the developed mathematical model can be applied for assessment of operating resistance also of other heat-resistant steels of martensite class [15][16][17][18].…”

Section: Prospects Of Further Researches In This Fieldmentioning

confidence: 99%

Selection of laser processing parameters for hot stamping tools based on mathematical planning of the experiment

Chichenev¹,

Chicheneva²,

Karfidov³

et al. 2021

cisisr

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“…Such hardness drop was reported in research that studied steel after quenching and tempering. It was observed in steel grades AISI 434 [6], and AISI H11 [7,8] that were bulk heat treated before laser hardening. The hardness drop results from the over-tempering effect that takes place when the area is heated above the initial tempering temperature but not austenitised (even partially).…”

Section: Introductionmentioning

confidence: 99%

“…Investigation of LSH focused on AISI H11 is less usual than the processing of slightly more alloyed AISI H13 with a higher content of vanadium [8,10]. The laser hardening was performed after quenching and tempering.…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Traverse Speed during Laser Hardening on Hardness Distribution and Microstructure of Hot Work Tool Steel H11

Hradil¹,

Nový²,

Hodek³

et al. 2023

Manufacturing Technology

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The paper describes the effect of laser traverse speed during laser hardening on hardness and microstructure. The experimental material is hot work tool steel AISI H11 with samples sized 100×100×35 mm. The initial state of the material before laser hardening is quenched and tempered. The laser hardening temperature is constant at 1100 °C, selected laser traverse speed was 1, 2, 4, and 6 mm/s. A numerical simulation performed in DEFORM-3D software before the experiment showed tendencies of temperature displacement and expected course of hardness. Increasing traverse speed leads to decreased laser-hardened depth and decreased hardness drop in the heat-affected zone (HAZ). The experimental program confirmed the results of the numerical model. The differences in the microstructure were investigated by light (LM) and scanning electron microscopes (SEM), which revealed an evident difference between the surface area and the locality with the lowest hardness. Local differences from the perspective of presence of carbides were analysed by energy dispersive spectroscopy (EDS). This investigation was performed to optimize laser traverse speed to improve the subsurface hardness profile, which is essential for the lifetime and reliability of forging dies.Laser hardening Hardness Numerical model Microstructure EDS analysis

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Effect of Laser Hardening on Die Steel Microhardness and Surface Quality

Cited by 17 publications

References 3 publications

Improving the Thermal Fatigue Strength of Hot-Working Tools by Laser Treatment

Improving the Thermal Fatigue Strength of Hot-Working Tools by Laser Treatment

Selection of laser processing parameters for hot stamping tools based on mathematical planning of the experiment

Effect of Laser Traverse Speed during Laser Hardening on Hardness Distribution and Microstructure of Hot Work Tool Steel H11

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