Subgrains, dislocations, and the elevated-temperature strength of Type 304 stainless steel

Conference · Wed Sep 28 04:00:00 EDT 1983

OSTI ID:6637308

Kassner, M E; Miller, A K

This article reviews the authors' previous investigations of the effects of dislocations and subgrains on the elevated-temperature strength of Type 304 stainless steel. Specifically, the separate roles of subgrains and forest dislocations on the elevated-temperature isotropic component of the strength were quantified by a root-mean-square (rms) equation. The rms equation accurately predicts the isotopic strength over a wide range of temperature (750 to 1065/sup 0/C). Over this temperature range, which includes both the power-law (PL) and power-law-breakdown (PLB) creep regimes, forest dislocation strengthening appears dominating. The kinematic or back-stress component of the strength was also studied. It was not found to be very strongly influenced by pronounced dislocation heterogeneities such as subgrain boundaries or cells. In the PLB regime, unlike the PL regime, well-defined subgrain boundaries are not stable and the steady-state structure consists primarily of diffuse or cell-like boundaries. This transition in subgrain boundary definition, however, is a manifestation of rather than a cause for PLB.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6637308
• Report Number(s): UCRL-89837; CONF-840909-1; ON: DE84001233
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORRELATIONS
CORROSION RESISTANT ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEFORMATION
DISLOCATIONS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
LINE DEFECTS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
STAINLESS STEEL-304
STAINLESS STEELS
STEELS