Influence of temperature and carbon content on the cyclic deformation and fatigue behavior of {alpha}-iron. Part 1: Cyclic deformation and stress behavior

Journal Article · Mon Mar 02 04:00:00 EST 1998 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(97)00362-5· OSTI ID:616384

Sommer, C; Mughrabi, H; Lochner, D ^[1]

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1. Univ. Erlangen-Nuernberg, Erlangen (Germany). Inst. fuer Werkstoffwissenschaften

The cyclic deformation and stress-strain behavior of pure {alpha}-iron polycrystals has been investigated in tests with small to intermediate plastic strain ranges {Delta}{epsilon}{sub pl} in the temperature range from 220 to 573 K. An analysis of the maximum stress amplitudes yields a high effective stress component {sigma}{sup *} at low temperatures and a maximum of the hardening at the transition temperature of about 340 K. In cyclic deformation with small {Delta}{epsilon}{sub pl} inverse cyclic stress-strain behavior (i.e. increasing stress amplitude with decreasing {Delta}{epsilon}{sub pl}) is observed and can be explained by an increase of {sigma}{sup *} with decreasing {Delta}{epsilon}{sub pl} caused by a decrease of the fraction of plastically deforming grains. Different effects of small carbon contents up to 74 wt ppm on the cyclic deformation behavior and on the corresponding microstructures were noted and characterized in tests at intermediate {Delta}{epsilon}{sub pl} in dependence on temperature.

• OSTI ID: 616384
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 5 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON ADDITIONS
DEFORMATION
FATIGUE
IRON-ALPHA
METALLURGICAL EFFECTS
MICROSTRUCTURE
TEMPERATURE DEPENDENCE