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Title: Physicomechanical properties of spring steel 70S2KhA after different heat treatments

Abstract

We have studied the magnetic, electrical, thermoelectric, and mechanical properties of steel 70S2KhA as a function of various quenching and tempering conditions. We examine the effect of a change in the chemical composition (within the grade limits) on the physical properties of the steel and the conditions for monitoring the heat treatment for the example of the coercive force, the relaxation coercive force, and the magnetic susceptibility.

Authors:
; ;
Publication Date:
OSTI Identifier:
460376
Resource Type:
Journal Article
Resource Relation:
Journal Name: Russian Journal of Nondestructive Testing; Journal Volume: 31; Journal Issue: 2; Other Information: PBD: Oct 1995; TN: Translated from Defektoskopiya; No. 2, 56-60(Feb 1995)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; IRON BASE ALLOYS; MECHANICAL PROPERTIES; PHYSICAL PROPERTIES; SILICON ALLOYS; COERCIVE FORCE; HEAT TREATMENTS; MAGNETIC SUSCEPTIBILITY; QUENCHING; RELAXATION; STEELS; CARBON ADDITIONS; MANGANESE ADDITIONS; CHROMIUM ADDITIONS; TEMPERATURE DEPENDENCE; TEMPERING

Citation Formats

Kuznetsov, I.A., Rodionova, S.S., and Nikiforov, A.P.. Physicomechanical properties of spring steel 70S2KhA after different heat treatments. United States: N. p., 1995. Web.
Kuznetsov, I.A., Rodionova, S.S., & Nikiforov, A.P.. Physicomechanical properties of spring steel 70S2KhA after different heat treatments. United States.
Kuznetsov, I.A., Rodionova, S.S., and Nikiforov, A.P.. 1995. "Physicomechanical properties of spring steel 70S2KhA after different heat treatments". United States. doi:.
@article{osti_460376,
title = {Physicomechanical properties of spring steel 70S2KhA after different heat treatments},
author = {Kuznetsov, I.A. and Rodionova, S.S. and Nikiforov, A.P.},
abstractNote = {We have studied the magnetic, electrical, thermoelectric, and mechanical properties of steel 70S2KhA as a function of various quenching and tempering conditions. We examine the effect of a change in the chemical composition (within the grade limits) on the physical properties of the steel and the conditions for monitoring the heat treatment for the example of the coercive force, the relaxation coercive force, and the magnetic susceptibility.},
doi = {},
journal = {Russian Journal of Nondestructive Testing},
number = 2,
volume = 31,
place = {United States},
year = 1995,
month =
}
  • The variations of the internal friction seem to show that during aging at 720 nif- C surface reactions entraining a progressive decarburization of the samples are produced between the metal and the ambient medium. Aging after tempering depends on the quantity of carbon initially in solution; when it was relatively high, the aging appears to take place in three steps. (tr-auth)
  • Chemical cleaning, vacuum firing, glow discharge cleaning, and in situ bakeout have become standard practice for lowering the outgassing rate and removing surface contaminants in the ultrahigh vacuum systems of particle accelerators and storage rings. This paper presents the work done with the thermal outgassing of several long stainless-steel (304LN and 316L) beam chambers with areas of more than 1 x 10/sup 4/ cm/sup 2/ . They were measured between 20 and 500 /sup 0/C after vacuum firing, glow discharge cleaning, or reactive gas (nitric oxide) cleaning. Outgassing rates of low 10/sup -13/ and low 10/sup -14/ Torr 1/s cm/supmore » 2/ were achieved for H/sub 2/ and CO, respectively, with vacuum firing alone. The outgassing of H/sub 2/ in this temperature range is consistent with that due to bulk diffusion with an enthalpy of 9 +- 1 kcal/mole. The photon stimulated desorption of the chamber surface after the above treatments were also studied by exposure to an intense photon beam at the National Synchrotron Light Source. The effectiveness and merits of reactive gas cleaning in removing the surface contaminants in large vacuum systems are compared to those of vacuum firing and glow discharge cleaning.« less
  • The authors study the stabilizing influence of rare-earth metals on the structural condition of thermomechanically worked steels. 45, 60, U8A, 50KhGA, and 70S2KhA steels were used for the investigation. The rare-earth metals used were lanthanum, cerium, and a mixture of rare-earth metals called mischmetal. Impact strength tests of Mesnager specimens at room temperature showed that the favorable influence of high-temperature thermomechanical working is strengthened with an increase in carbon content in the steel. Results are shown of investigations at sub-zero temperatures of Charpy specimens with an initiated fatigue crack. Rare-earth metal microadditions are shown to have a good influence onmore » the structurally sensitive characteristics of the steel, the contact strength and the corrosion resistance. Rare-earth metals also retard the development of the recrystallization processes of the deformed austenite.« less
  • The 77 to 1,200 K tensile properties of approximately 1.3 mm thick wrought sheet Co-base Haynes alloy 188 and Ni-base Haynes alloy 230 and Inconel 617 have been measured after heat treatment in air and vacuum for periods up to 22,500 h at 1,093 K. Significant changes in structure were produced by prior exposures, including precipitation of second phases and, in the case of heat treatment in air, oxide scale and surface-connected grain boundary pits/oxides, as deep as 50 to 70 [mu]m, in all three superalloys. Due to the geometry of the experiment, the vacuum-exposed samples were protected from lossmore » of volatile elements by evaporation; hence, such specimens were simply given 1,093 K anneals in an innocuous environment, which produced very little surface attack. Compared to the properties of as-received alloys, prior exposure tended to reduce both the yield strength and ultimate tensile strength, with the greatest reductions at 77 and 298 K. The most dramatic effect of heat treatment was found in the low-temperature residual tensile elongation, where decreases from 40 to 5% at 77 K were found. Ductility is the only property that was found to have a consistent dependency on environment, with air exposure always yielding less tensile elongation than vacuum exposure.« less