Microstructural characterization and properties of 3Cr-1. 5Mo-0. 1V thick section electron beam welds

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5358304

David, S A; King, J F; Vitek, J M

Single pass, full penetration, thick-section (10 cm) electron beam weldments of high integrity were made of 3Cr-1.5Ml-0.1V steel using a 100 kW Sciaky electron beam welder. The weldment was characterized using microhardness measurements, Charpy V-notch impact, tensile, and guided bend tests. Microstructural characterization was done using both optical and electron microscopy. The mechanical properties results showed the electron beam weldments had properties that matched those of the base metal. A hardness minimum within the heat-affected zone (HAZ) was observed on either side of the fusion zone. Such a minimum is commonly observed in ferritic steel weldments, although this region was very narrow compared to the weldments made by other conventional processes. Microstructural characterization of the weld revealed that the fusion zone and immediately surrounding HAZ contained retained austenite between the bainite laths. Further away from the fusion zone, the HAZ structure consisted of bainite and proeutectoid ferrite, which corresponded to the drop in the microhardness, and resulted in a minimum. Tempered bainite was observed beyond this minimum in the HAZ. 14 figs., 2 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5358304
• Report Number(s): CONF-880547-1; ON: DE88004330
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHARPY TEST
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CRYSTAL STRUCTURE
DESTRUCTIVE TESTING
ELECTRON BEAM WELDING
FABRICATION
FERRITIC STEELS
HARDNESS
HEAT AFFECTED ZONE
IMPACT TESTS
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
MICROHARDNESS
MICROSTRUCTURE
STEELS
TESTING
WELDED JOINTS
WELDING
ZONES