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- Title
EVALUATION OF SUSCEPTIBILITY TO TEMPER BRITTLENESS OF HEAT-RESISTANT STEELS USING HIGH-TEMPERATURE TESTING.
- Authors
SKULSKY, V. Yu.; ZHUKOV, V. V.; NIMKO, M. A.; MORAVETSKY, S. I.; MISHCHENKO, L. D.
- Abstract
Main point of problem of crack formation in tempering is defined. It is shown that low metal ductility during plastic deformation, promoted by stress relaxation is a condition for nucleation of such cracks. Important brittleness factor under these conditions is temporarily developing secondary hardening, related with nucleation and precipitation of secondary phases in matrix. Since alloys with different level of alloying demonstrate different behavior during tempering, then evaluation of their possible tendency to temper brittleness is of interest in each specific case. A procedure is described for high-temperature tensile testing, which allows evaluating ductile properties of metal under different tempering conditions. Susceptibility to temper brittleness was evaluated using a criterion of value of relative reduction in area y ≤ 25 %. Studied was a nature of ductility change in complexly-alloyed heat-resistant steels under different tempering modes resulting in secondary hardening condition and after hardening stage. It is shown that steels in a period of steel hardening development have low ductility with typical for such a state intergranular fracture. Determined are critical tempering modes, under which a high ductility state is achieved, based on which absence of susceptibility to tempering cracks can be predetermined. 9 Ref., 1 Table, 8 Figures.
- Subjects
SURFACE cracks; HEAT treatment of steel; SURFACE hardening
- Publication
Paton Welding Journal, 2016, Issue 2, p22
- ISSN
0957-798X
- Publication type
Article
- DOI
10.15407/tpwj2016.02.04