Choice of the regime of preliminary heat treatment of steel 20KhN3MFA ensuring satisfactory machinability

Previously abstracted from original as item 9108-56-0924. A tempering heat treatment at 660 plus/minus 10 deg C for 6 h was used to produce a fine grain pearlite in 20KhN3MFA steel and to improve machinability relative to tempering at lower and higher temperatures. This heat treatment produced a har...

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Bibliographic Details
Published in:Metal science and heat treatment 1991, Vol.33 (1-2), p.3-5
Main Authors: EVDOKIMOV, V. V, TSVETKOV, YU. N
Format: Article
Language:English
Subjects:
Applied sciences
Cutting
Exact sciences and technology
Machining. Machinability
Metals. Metallurgy
Production techniques
Online Access:Get full text
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Summary:Previously abstracted from original as item 9108-56-0924. A tempering heat treatment at 660 plus/minus 10 deg C for 6 h was used to produce a fine grain pearlite in 20KhN3MFA steel and to improve machinability relative to tempering at lower and higher temperatures. This heat treatment produced a hardness of 241-269 HB. A rapid method of assessing machinability, based on temperature measurements near the cutting zone during lathe turning in a single pass, correlated well with tool wear results obtained in machining trials on experimental stampings. Tempering for periods longer than 6 h at 660 deg C did not improve machinability further.
ISSN:0026-0673
1573-8973
DOI:10.1007/BF00775022