SCIENTIFIC ABSTRACT MARKO, I. - MARKON, L.O.

• Document Type: CREST
• Collection: Scientific Abstracts
• Document Number (FOIA) /ESDN (CREST): CIA-RDP86-00513R001032420011-7
• Release Decision: RIF
• Original Classification: S
• Document Page Count: 100
• Document Creation Date: November 2, 2016
• Document Release Date: September 19, 2001
• Sequence Number: 11
• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

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_iW636393 SOURCE CODE: UR/0032/66/032/011 /14 05 /14 O9______1
AUTHOR: Bernahtey-n, M. L.; Marko, I.
ORG: Moscow Institute of Steel and Alloys (Mookovskiy institut stall i splavov)
TITLE: Characteristics of strese-strain diagrams of superstrength steel with strain-
hardened martensite
SOURCE: Zavodskaya laboratoriya, v. 32, no. 11, 1966, 1405-1ho6
TOPIC TAGS: superstrength steel, steel thermomecbanica-1 treatment, fitreso strain
diagram, strain hardening/5OKhFA steel
ABSTRACT: Specimens of 50KhFA steel were subjected to a combined thermomechnnical
treatment (CTMT) which consisted of high-temperature thermomechanical treatment
followed by quenching to obtain a martensitiC structure and tempering at 200C for
2 hr, and low temperature thermomechanical treatment (LTMT) which consisted of
cold deformation with 1-3% reduction followed by aging at 100C for 40 hr. The
diagrams of the conventionally treated specimens did not show a distinct yield
point. The thermomechanically treated specimens, however, show very distinct upper
and lower yield points (see Fig. 1). The difference between these tvo points in-
creased v1th increasing reductions in LTNrtand in specimens deformed with 3% reduc-
tion, amounted to 55 kg/m 2 j It Is assumed that aging of martensite vhose matrix
Cord
'2.2

AP6036393
~Ig. 1. The effect of reduction in martensite
deformation on the shape of the stress-strain
curve of 50KhFA steel
AV - I - Conventionally hardened and tempered at
20OC; 2 - same with 1% reduction aged at 100C
-for 40 hr-, 3 - same vith 2% reductionj 4
4 same vith 3% reduction.
11ougation, Z
vas distorted by cold deformation plays a significant part in strengthening. The
second maximum on the stress-strain curve corresponds to the intensiye reduction of
area and is brought about by the strain aging occuring during the test. Orig. art,
hasi 3 figures.
SUB CODE: 11, 13/ SUBM DATE. none/ ORIG REF: 0021 OTH RIWI 002/
ATD PRESS: 510T

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