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Research on High Temperature Performance of Mould Materials with High Current Pulsed Electron Beam Alloying

Author: HanChao
Tutor: ChenYuanFang
School: Chongqing University of Technology
Course: Materials Processing Engineering
Keywords: Electron beam surface alloying 3Cr2W8V 40Cr High temperature oxidation resistance Thermal fatigue performance
CLC: TG174.4
Type: Master's thesis
Year: 2011
Downloads: 53
Quote: 2
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Abstract


Mold industry occupies a very important position in modern manufacturing, 50% of the finishing product and 75% of semi-finished products to be used for mold manufacturing, mold cost share of the cost of a higher proportion of parts production, usually 40% left and right, and 80% in the form of die failure surface damage, surface modification technology has good prospects in the modern manufacturing. With industrial development, the mold of the work environment has become increasingly harsh, high temperature oxidation resistance and thermal fatigue properties of the mold material determines the life of the mold in the high temperature environment. The high temperature oxidation is the most common high-temperature environment is the most important forms of corrosion damage, and the thermal fatigue properties determines whether the die surface in the micro-cracks under the action of the thermal cycles, which induce failure of the mold. This paper by electron beam surface alloying the emerging surface modification technology, in the mold material surface alloying, without loss of the surface properties of the material at the same time, the electron beam surface alloying on high temperature properties of the mold material, in order to strengthen the theoretical basis of the actual mold industry mold high temperature performance. In this paper, the finite element software ANSYS 12.0 3Cr2W8V surface alloying of Al thermal stress coupling field simulation analysis, and Russian high-current electron beam of the Institute of Electronics R \u0026 D equipment for the thermal die steel 3Cr2W8V surface direct electron beam irradiation and electron beam surface alloying treatment, the alloying elements Al, Ti, TiN, respectively, and the surface treatment and the surface of the electron beam of the electron beam on the surface of the mold material 40Cr alloyed Al element. Combination of theoretical and experimental summed up: 1) finite element simulation of electron beam alloying process; 2) the impact of the electron beam surface alloying on the mechanical properties of the material; 3) electron beam surface alloying on high temperature properties of the mold material. The experimental results show that: 1) the sample surface after electron beam irradiation, remelting and generates craters morphology, the influence of the surface roughness of different samples are not the same; hardness and wear resistance of the sample surface by the electron beam irradiation after there is a certain increase relative to the original sample. 2) oxidation kinetics curves show the high temperature oxidation resistance has been markedly improved by the electron beam alloying process samples, while the high temperature oxidation resistance of electron beam direct irradiation of samples did not improve. By topography and spectroscopy analysis 3Cr2W8V electron beam alloying Al oxide film of the sample alloy layer intensity and oxygen barrier were better than the original sample and electron beam direct exposure to the sample. 3) after electron beam irradiation, thermal fatigue properties of the samples decreased this article is to explore the phenomenon from three angles of the roughness of the surface residual stress and surface morphology, and suggest improvements to the traditional experimental program.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
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