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Successive carbon- and boron saturation of KhVG steel in powder mixtures

Journal Article:

Abstract

Method of successive saturation of KhVG steel with carbon and boron in powder mixtures is described. After carbonization of steel in a charcoal carburator at 930 deg C during 3 hrs a domain of equiaxial large grains is formed there the latter representing carbides of Fe/sub 3/C and (Fe, M)/sub 3/C. The increase of duration of carbonization up to 5 hrs and above results in formation of a cement grid greatly impairing the mechanical properties of the metal. Carbonization is followed by borating in powdered technical boron carbide at 900 deg C for 4 hrs which ensures formation on the sample surface of a borated layer with depth up to 65 mkm covering the carbonized zone. As followed from metallographic and x-ray structural analysis, the borated layer consists of boride needles with complex composition (Fe, Cr, Mn)B. Oil hardening of carbonized KhVG steel from 850 deg C and low-temperature tempering at 180 deg C for 1 hr results in formation in the main metal of martensite-carbide structure and, respectively, in the decrease of the microhardness gradient between the diffusion layers, as compared with borated KhVG steel. Operation tests of strengthened matrices of preforming machines under the conditions of application of  More>>
Publication Date:
Jan 01, 1975
Product Type:
Journal Article
Reference Number:
AIX-08-320988; EDB-77-120364
Resource Relation:
Journal Name: Metalloved. Term. Obrab. Met.; (USSR); Journal Volume: 12; Other Information: For English translation see the journal Met. Sci. Heat Treat
Subject:
36 MATERIALS SCIENCE; CHROMIUM ALLOYS; CARBURIZATION; SATURATION; MANGANESE ALLOYS; STEELS; TUNGSTEN ALLOYS; ANNEALING; BORIDES; BORON CARBIDES; CARBON; DIFFUSION COATINGS; HIGH TEMPERATURE; MARTENSITE; METALLOGRAPHY; MICROHARDNESS; MICROSTRUCTURE; MIXTURES; POWDERS; QUENCHING; STRUCTURAL CHEMICAL ANALYSIS; TIME DEPENDENCE; VERY HIGH TEMPERATURE; ALLOYS; BORON COMPOUNDS; CARBIDES; CARBON ADDITIONS; CARBON COMPOUNDS; COATINGS; CRYSTAL STRUCTURE; DISPERSIONS; ELEMENTS; HARDENING; HARDNESS; HEAT TREATMENTS; IRON ALLOYS; IRON BASE ALLOYS; MECHANICAL PROPERTIES; NONMETALS; SURFACE HARDENING; SURFACE TREATMENTS; 360105* - Metals & Alloys- Corrosion & Erosion
OSTI ID:
7324758
Country of Origin:
USSR
Language:
Russian
Other Identifying Numbers:
Journal ID: CODEN: MTOMA
Submitting Site:
INIS
Size:
Pages: 61-62
Announcement Date:

Journal Article:

Citation Formats

Alimov, Yu A, and Gordienko, S I. Successive carbon- and boron saturation of KhVG steel in powder mixtures. USSR: N. p., 1975. Web.
Alimov, Yu A, & Gordienko, S I. Successive carbon- and boron saturation of KhVG steel in powder mixtures. USSR.
Alimov, Yu A, and Gordienko, S I. 1975. "Successive carbon- and boron saturation of KhVG steel in powder mixtures." USSR.
@misc{etde_7324758,
title = {Successive carbon- and boron saturation of KhVG steel in powder mixtures}
author = {Alimov, Yu A, and Gordienko, S I}
abstractNote = {Method of successive saturation of KhVG steel with carbon and boron in powder mixtures is described. After carbonization of steel in a charcoal carburator at 930 deg C during 3 hrs a domain of equiaxial large grains is formed there the latter representing carbides of Fe/sub 3/C and (Fe, M)/sub 3/C. The increase of duration of carbonization up to 5 hrs and above results in formation of a cement grid greatly impairing the mechanical properties of the metal. Carbonization is followed by borating in powdered technical boron carbide at 900 deg C for 4 hrs which ensures formation on the sample surface of a borated layer with depth up to 65 mkm covering the carbonized zone. As followed from metallographic and x-ray structural analysis, the borated layer consists of boride needles with complex composition (Fe, Cr, Mn)B. Oil hardening of carbonized KhVG steel from 850 deg C and low-temperature tempering at 180 deg C for 1 hr results in formation in the main metal of martensite-carbide structure and, respectively, in the decrease of the microhardness gradient between the diffusion layers, as compared with borated KhVG steel. Operation tests of strengthened matrices of preforming machines under the conditions of application of dynamic pressing forces up to 1500 kg Fce/cm/sup 2/ demonstrated that the cyclical strength of carboborated coverings is 2.0-3.0 times higher than that of borated ones. The method of carboborating is recommended for strengthening the details of stamp and press tools.}
journal = {Metalloved. Term. Obrab. Met.; (USSR)}
volume = {12}
journal type = {AC}
place = {USSR}
year = {1975}
month = {Jan}
}