Additional heat treatment of non-porous coatings obtained on medium carbon steel substrates by electron beam cladding of a Ti-Mo-C powder composition

International Conference on Mechanical Engineering, Automation and Control Systems 2015

机械制造;无线电电子学;计算机科学

Mul, D.O.^1 ; Drobyaz, E.A.^1 ; Zimoglyadova, T.A.^1 ; Bataev, V.A.^1 ; Lazurenko, D.V.^1 ; Shevtsova, L.I.^1

Novosibirsk State Technical University, 20, Karla Marksa St., Novosibirsk

630092, Russia^1

关键词: After-heat treatment;    Cementite particle;    Electron beam claddings;    High-temperature tempering;    Medium carbon steel substrate;    Nano-sized particles;    Porous coatings;    Powder composition;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/124/1/012130/pdf
DOI  :  10.1088/1757-899X/124/1/012130

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The structure and microhardness of surface layers, obtained by non-vacuum electron beam cladding of Ti-Mo-C powder mixture on a steel substrate after different types of heat treatment, were investigated. After cladding samples were heat treated in a furnace at 200...500 °C, as well as quenched at 860 ° C and then underwent high-temperature tempering. Heat treatment of cladded coatings induced tempering of martensite and precipitation of cementite particles (Fe3C). Transmission electron microscopy of the samples after heating and holding at 300 ° C revealed precipitation of nanosized cubical TiC particles. The formation of hard nanosized particles led to the surface layer microhardness growth. The highest level of microhardness (which was 1.2...1.5-fold higher in comparison with coating microhardness after heat treatment) was achieved after heating of the claded material at 300 °C and 400 °C Additional quenching of samples at 860 °C did not increase the microhardness level.