The Strength of Martensite

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Abstract:

Fe-Ni-C alloys were selected to determine the role of C in the strengthening of virgin (untempered) martensite. Martensites formed at subzero temperatures were maintained at low-temperature levels for the studies. The axial ratio of the tetragonal lattice increased with the C concentration, but there was an extra tetragonality independent of C and which is thought to result from the presence of stacking faults. The extra tetragonality disappeared on aging above room temperature where the regular tempering reactions occur. The C-dependent strengthening of virgin martensite can be described as a solid-solution hardening phenomenon. The fine structure of the martensite is thought to be a contributory factor in the over-all strengthening. In addition, at temperatures above about -60 deg C, age hardening due to carbide precipitation provides a further component of strengthening which increases with the carbon content; this increment is relatively small compared to the solid-solution effect.

Author(s):
Winchell, P. G. ; Cohen, Morris
Author Organization(s):
MASSACHUSETTS INST OF TECH CAMBRIDGE
Funding Organization(s):
Office of Naval Research, Arlington , VA
Document Type:
Technical Report/Technical Report
Publication Date:
1962 Mar 01
Pagination:
52

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution Code:
A - Approved For Public Release
Distribution Statement: Public Release

RECORD

Collection: TRECMS
Identifying Numbers
Contract Number(s):
Nonr-1841(35)
Subject Terms
Communities of Interest:
Weapons Technologies
Descriptor(s):
chemistry, materials, metallurgy, solid solutions, alloys, metals, age hardening, chemical compounds, crystal structure, hardening, iron, physics, steel, engineering, military research, new york, nuclear energy
Subject Categories:
Biological and Medical Sciences; Materials
Update Date:
2021 Jul 15