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Title: Characterizing and improving the toughness of thick-sectioned 2-1/4 Cr-1Mo electroslag weldments. Final report, June 30, 1978-October 30, 1981

Abstract

A functional relation between the major electroslag welding process variables of potential, current, and electrode velocity has been developed. A two-dimensional heat transport model has been developed for heat flow in the parent metal plates of electroslag welds. An energy balance has been developed for the electroslag welding process. Two-dimensional process variable plots have been developed which predict the correct operating conditions required for weld penetration in electroslag welds of 2-1/4 Cr-1 Mo steel. It was shown that oxygen pickup, tramp element pickup, and alloy element oxidation losses in electroslag welding are primarily caused by electrochemical rather than thermochemical reactions. An electrochemical cell was used to study cathode reactions and to obtain current efficiency data for oxygen pickup, alloy element oxidation losses, and Al pickup in 2-1/4 Cr-1 Mo electroslag welds. A relation has been developed for alloy and tramp element concentration changes. Welding and post-weld heat treatment procedures have been developed which provide excellent toughness in the fusion zones of 2-1/4 Cr-1 Mo steel welds without a re-austenization heat treatment. An experimental determination has been made of the microstructures which produce high toughness in 2-1/4 Cr-1 Mo steel weld fusion zones. 21 figures.

Authors:
;
Publication Date:
Research Org.:
Colorado School of Mines, Golden (USA). Dept. of Metallurgial Engineering
OSTI Identifier:
7088871
Report Number(s):
DOE/ET/12313-4; ORNL/Sub-7219/1
ON: DE83000875
DOE Contract Number:  
AS05-78ET12313
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHROMIUM-MOLYBDENUM STEELS; ELECTROSLAG WELDING; FRACTURE PROPERTIES; WELDED JOINTS; ENERGY BALANCE; HEAT TRANSFER; MICROSTRUCTURE; PLATES; ALLOYS; CHROMIUM ALLOYS; CHROMIUM STEELS; CRYSTAL STRUCTURE; ENERGY TRANSFER; FABRICATION; IRON ALLOYS; IRON BASE ALLOYS; JOINING; JOINTS; MECHANICAL PROPERTIES; STEELS; WELDING; 360101* - Metals & Alloys- Preparation & Fabrication

Citation Formats

Edwards, G R, and Frost, R H. Characterizing and improving the toughness of thick-sectioned 2-1/4 Cr-1Mo electroslag weldments. Final report, June 30, 1978-October 30, 1981. United States: N. p., 1981. Web.
Edwards, G R, & Frost, R H. Characterizing and improving the toughness of thick-sectioned 2-1/4 Cr-1Mo electroslag weldments. Final report, June 30, 1978-October 30, 1981. United States.
Edwards, G R, and Frost, R H. 1981. "Characterizing and improving the toughness of thick-sectioned 2-1/4 Cr-1Mo electroslag weldments. Final report, June 30, 1978-October 30, 1981". United States.
@article{osti_7088871,
title = {Characterizing and improving the toughness of thick-sectioned 2-1/4 Cr-1Mo electroslag weldments. Final report, June 30, 1978-October 30, 1981},
author = {Edwards, G R and Frost, R H},
abstractNote = {A functional relation between the major electroslag welding process variables of potential, current, and electrode velocity has been developed. A two-dimensional heat transport model has been developed for heat flow in the parent metal plates of electroslag welds. An energy balance has been developed for the electroslag welding process. Two-dimensional process variable plots have been developed which predict the correct operating conditions required for weld penetration in electroslag welds of 2-1/4 Cr-1 Mo steel. It was shown that oxygen pickup, tramp element pickup, and alloy element oxidation losses in electroslag welding are primarily caused by electrochemical rather than thermochemical reactions. An electrochemical cell was used to study cathode reactions and to obtain current efficiency data for oxygen pickup, alloy element oxidation losses, and Al pickup in 2-1/4 Cr-1 Mo electroslag welds. A relation has been developed for alloy and tramp element concentration changes. Welding and post-weld heat treatment procedures have been developed which provide excellent toughness in the fusion zones of 2-1/4 Cr-1 Mo steel welds without a re-austenization heat treatment. An experimental determination has been made of the microstructures which produce high toughness in 2-1/4 Cr-1 Mo steel weld fusion zones. 21 figures.},
doi = {},
url = {https://www.osti.gov/biblio/7088871}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1981},
month = {Thu Jan 01 00:00:00 EST 1981}
}

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