Abstract
The method of low-temperature (400–500°C) cementation of AISI430 stainless steel by decomposition of acetylene in a wide (100 cm2) low-energy (200–300 eV) electron beam generated plasma in an Ar+C2H2 gas mixture was investigated. The composition of a beam Ar+C2H2-plasma is investigated and it is shown that the degree of decomposition of acetylene varies with the current and energy of the electron beam. It is shown that the magnitude of the flow of acetylene significantly affects the formation rate and hardness of the hardened layer. From the obtained results it can be seen that at fixed values of argon pressure ( ~ 0.8 mTorr), beam current (3.5 A), bias voltage (–120 V), sample temperature (500°C) and exposure time (3 h) increase in QC2H2 from 1 to 4–5 cm3·min−1 leads to an increase in the thickness and microhardness of the hardened layer. With a further increase in QC2H2, an abrupt decrease in the rate of formation of the hard layer occurs.
Highlights
Plasma cementation is one of the types of chemical heat treatment, and consists in the diffusion saturation of the surface layer of the products with the alloying element – carbon
The composition of a beam Ar+C2H2-plasma is investigated and it is shown that the degree of decomposition of acetylene varies with the current and energy of the electron beam
From the obtained results it can be seen that at fixed values of argon pressure (~ 0.8 mTorr), beam current (3.5 A), bias voltage (–120 V), sample temperature (500°C) and exposure time (3 h) increase in QC2H2 from 1 to 4–5 cm3 min-1 leads to an increase in the thickness and microhardness of the hardened layer
Summary
Plasma cementation is one of the types of chemical heat treatment, and consists in the diffusion saturation of the surface layer of the products with the alloying element – carbon. The method of low-temperature (400–500°C) cementation of AISI430 stainless steel by decomposition of acetylene in a wide (100 cm2) low-energy (200–300 eV) electron beam generated plasma in an Ar+C2H2 gas mixture was investigated.
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