A Study of Weld Heat-affected Zones in the Titanium - 6a1-6v-2sn Alloy PDF Download
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Author: RICHARD E. LEWIS
Publisher:
ISBN:
Category :
Languages : en
Pages : 53
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Book Description
A new high-strength alpha-beta type titanium alloy was recently developed which is heat treatable to useful yield strengths above 180,000 psi, with 7 percent elongation, 16 percent reduction in area, and 7 ft.-ibs. Charpy V-notch impact energy at -40 F. Preliminary manual welding experience with this alloy disclosed a strong tendency for cracking in the heat-affected zone. This study was performed to determine resultant toughness in the heat affected zones for various welding conditions. Preheat was the most influential factor in retaining toughness in solution treated and aged base metal welding without it caused severe losses in impact strength and notched tensile strength which could not be recovered by aging treatments afterwards or resolution treating and aging. Mechanisms causing changes in properties involving beta becomes alpha and beta becomes alpha' on cooling, and alpha' becomes alpha + beta and beta becomes alpha upon reheating were studies by X-ray diffraction volumetric analysis and photomicrographic techniques. No evidence of omega phase forming or transforming was found in the aging procedures studied.
Author: RICHARD E. LEWIS
Publisher:
ISBN:
Category :
Languages : en
Pages : 53
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Book Description
A new high-strength alpha-beta type titanium alloy was recently developed which is heat treatable to useful yield strengths above 180,000 psi, with 7 percent elongation, 16 percent reduction in area, and 7 ft.-ibs. Charpy V-notch impact energy at -40 F. Preliminary manual welding experience with this alloy disclosed a strong tendency for cracking in the heat-affected zone. This study was performed to determine resultant toughness in the heat affected zones for various welding conditions. Preheat was the most influential factor in retaining toughness in solution treated and aged base metal welding without it caused severe losses in impact strength and notched tensile strength which could not be recovered by aging treatments afterwards or resolution treating and aging. Mechanisms causing changes in properties involving beta becomes alpha and beta becomes alpha' on cooling, and alpha' becomes alpha + beta and beta becomes alpha upon reheating were studies by X-ray diffraction volumetric analysis and photomicrographic techniques. No evidence of omega phase forming or transforming was found in the aging procedures studied.
Author: Michael John Ball
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 214
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Book Description
"The purpose of the investigation was to study the effect of material thickness, weld heat input and post weld heat treatment on the tensile properties and microstructure of Ti-6Al-6V-2Sn Titanium, and obtain a practical weld/thermal treatment cycle. The objectives were accomplished by electron beam and gas tungsten arc welding 0.060, 0.125 and 0.250 inch thick material and then heat treating at various temperatures and times. Electron beam and gas tungsten arc welding enabled an approximate 4:1 ratio of heat inputs to be utilized. Resultant welded and heat treated material was tensile tested and metallographically examined. Heat treatments involved both air and furnace cooling from temperatures as high as 1550°F. Post weld heat treatments involving air cooling resulted in partial solution treatment and yield strengths as low as 50% of the as-received properties. Elongation values were also lower than those achieved from heat treatments involving furnace cooling. The effect was considerably increased with increasing heat treatment temperature. The most practical post weld heat treatment of 1400°F for 4 hours and furnace cool resulted in strengths that were 95-100% of the as-received properties. Elongation values varied from as low as 2% in the as-welded condition to 7-12% following this post weld heat treatment. The microstructure revealed a fusion zone with considerable alpha plate growth compared with the typical as-welded coarse transformed beta and the structures approach equilibrium quantities of the alpha and beta phases and equilibrium composition of the individual phases. Increasing material thickness and decreasing weld heat input had little effect on tensile strength, however ductility was increased by 2-3% elongation"--Abstract, pages ii-iii.
Author: Maḥmūd Fawzī Ḥamad
Publisher:
ISBN:
Category :
Languages : en
Pages : 48
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 704
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Author: Ernest F. Nippes
Publisher:
ISBN:
Category :
Languages : en
Pages : 77
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Author: Symposium on Impact Testing of Metals
Publisher: ASTM International
ISBN: 9780803100381
Category : Impact
Languages : en
Pages : 323
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Author:
Publisher:
ISBN:
Category : Welding
Languages : en
Pages : 1090
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Book Description
"Current welding literature" included in each volume.
Author: H. Burte
Publisher: Springer Science & Business Media
ISBN: 1475713460
Category : Technology & Engineering
Languages : en
Pages : 758
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Author: Naval Research Laboratory (U.S.)
Publisher:
ISBN:
Category : Naval research
Languages : en
Pages : 308
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Author: J. J. Chyle
Publisher:
ISBN:
Category : Titanium
Languages : en
Pages : 94
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Book Description
