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Weld heat-affected zones in Ti--6Al--2Nb--1Ta--1Mo

Journal Article · · Weld. J. (N.Y.), v. 53, no. 3, pp. 117s-124s
OSTI ID:4306149
The heat-affected zone in Ti-6211 was studied using Gleeble synthetic specimen techniques. Impact results from synthetic specimens indicated that poor notch ductility can be anticipated in certain regions of the heat-affected zone that are heated above 2000 deg F. Metallographic examination showed the structure in this region to be alpha /sup 1/-martensite in coarse former BETA grains. The cooling conditions that govern the formation of the alpha /sup 1/-martensite were established and attempts were made to improve the impact strength in the heat-affected zone by reducing the cooling rate. No significant improvement could be obtained and it was concluded that the poor impact properties were a result of the coarse-grained structure developed in this region. Poor impact properties were also obtained in synthetic specimens that were heated through weld thermal cycles having peak temperatures of 1000 to 1200 deg F. No change in microstructure was observed and it was concluded that this was probably a result of an ordering reaction. Good correlation was established between actual heat- affected-zone microstructures and simulated structures produced in the Gleeble. (auth)
Research Organization:
Dept. of Energy, Ottawa
NSA Number:
NSA-29-024695
OSTI ID:
4306149
Journal Information:
Weld. J. (N.Y.), v. 53, no. 3, pp. 117s-124s, Journal Name: Weld. J. (N.Y.), v. 53, no. 3, pp. 117s-124s; ISSN WEJUA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

*ALUMINIUM ALLOYS-- IMPACT STRENGTH
*MOLYBDENUM ALLOYS-- IMPACT STRENGTH
*NIOBIUM ALLOYS-- IMPACT STRENGTH
*TANTALUM ALLOYS-- IMPACT STRENGTH
*TITANIUM BASE ALLOYS-- IMPACT STRENGTH
COOLING
GRAIN SIZE
HEAT AFFECTED ZONE
IMPACT TESTS
MARTENSITE
METALLOGRAPHY
MICROSTRUCTURE
N50220* --Metals
Ceramics
& Other Materials--Metals & Alloys--Preparation & Fabrication
N50230 --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
THERMAL CYCLING
VERY HIGH TEMPERATURE
WELDED JOINTS