Surface Electric Arc Hardening of Low-Carbon Steels

E.N. Safonov; M.V. Mironova

doi:10.4028/www.scientific.net/MSF.989.318

Paper Titles

Features of Laser Treatment of Corrosion-Resistant Steels of Austenitic and Carbide Classes
p.296

Statistical Analysis of Grain Structures Formed by Solid-State Diffusion at Annealing
p.301

Regulation of the Properties of Construction Composites Depending on the Material Composition
p.306

Cavitation Erosion-Corrosion Behavior of Fe-Cr Steel Induced by Ultrasonic Vibration
p.312

Surface Electric Arc Hardening of Low-Carbon Steels
p.318

Microstructure and Mechanical Properties of the Heat Treated Hy-TUF Steel
p.324

The Effect of Manganese-Containing Pigment on the Strength of Ceramic Bricks
p.329

Influence of Homogenization Heat Treatment and Cooling Modes on Microstructure of AA7475 Aluminum Alloy Ingot
p.335

The Creation of Multicomponent Octahedral Crystals with Spinel Structure Using Solid-Phase Synthesis in the Al₂O₃-BaO-CuO-Fe₂O₃-Mn₂O₃-NiO-SrO-TiO₂- ZnO and Al₂O₃-BaO-CuO-Fe₂O₃-NiO-SrO-TiO₂-WO₃- ZnO Systems
p.341

HomeMaterials Science ForumMaterials Science Forum Vol. 989Surface Electric Arc Hardening of Low-Carbon...

Surface Electric Arc Hardening of Low-Carbon Steels

Abstract:

Examined geometric characteristics, microhardness and features of structure formation in the heat affected zone of steels 09G2, 20L, 20FL. These studies were carried out after surface quenching by a magnetically controlled (scanning) DC electric arc in a protective argon atmosphere. It is shown that electric arc hardening forms on the treated surface of the steel a thin layer of martensitic-austenitic structure with varying composition and hardness. A ferrite-austenitic structure is formed in the region of transition from the base metal to the heat-strengthened metal. This structure contains crushed ferrite grain and winding boundaries between the structural components. On the periphery of austenitic grains martensitic layer is observed. Repeated heating, occurring during heat treatment of the adjacent surface area, is accompanied by a partial decay of martensite and austenite of a pre-hardened structure with the formation of bainite-and sorbitol-like tempering structures. On the surface, experienced repeated heating, the volume fraction of austenite increases. The dependences allowing to control the structural state and depth of the hardening zone are established.