Microstructure and mechanical properties of a 3 Cr-1. 5 Mo steel

Technical Report · Sun Sep 01 04:00:00 EDT 1985

OSTI ID:5138241

Klueh, R L; Nasreldin, A M

Tensile and impact properties were determined for an alloy steel (3 wt % Cr-1.5 wt % Mo-0.1 wt % V-0.1 wt % C) considered a candidate for elevated-temperature pressure-vessel applications. The steel was tested in two heat-treated conditions: normalized and tempered and quenched and tempered. Mechanical properties were determined for various tempering conditions (time and temperature) as described by a tempering parameter. Similar tempering treatments for the quenched and the normalized steels led to similar strengths. However, for the lowest tempering parameter used, the impact properties for the quenched-and-tempered steel exceeded those for the normalized-and-tempered steel, resulting in an excellent ductile-brittle transition temperature (-70/sup 0/C) and upper-shelf energy (225 J) for the quenched-and-tempered steel at a high strength (770 MPa ultimate tensile strength). Further tempering reduced the strength of the steel in both heat-treated conditions. The impact properties of the quenched steel were only slightly changed by further tempering, but those of the normalized steel improved, eventually equaling those of the quenched-and-tempered steel. Transmission electron microscopy showed that the quenched steel formed carbide-free acicular bainite and that the normalized steel formed granular bainite. The results indicate that properties might be optimized by proper heat treatment. 29 refs., 13 figs., 5 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5138241
• Report Number(s): ORNL-6206; ON: DE86002564
• 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-MOLYBDENUM STEELS
CRYSTAL STRUCTURE
DATA
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
HARDNESS
HEAT TREATMENTS
IMPACT STRENGTH
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
NUMERICAL DATA
STEELS
TENSILE PROPERTIES
TRANSMISSION ELECTRON MICROSCOPY