The Phenomenon of Hot-salt Stress-corrosion Cracking of Titanium Alloys
Author: W. K. Boyd
Publisher:
Published: 1964
Total Pages: 52
ISBN-13:
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Author: W. K. Boyd
Publisher:
Published: 1964
Total Pages: 52
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DOWNLOAD EBOOKAuthor: Hugh R. Gray
Publisher:
Published: 1969
Total Pages: 26
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DOWNLOAD EBOOKAuthor: R. S. Ondrejcin
Publisher:
Published: 1971
Total Pages: 36
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DOWNLOAD EBOOKAuthor: SP. Rideout
Publisher:
Published: 1968
Total Pages: 13
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DOWNLOAD EBOOKThe initial stages of hot-salt stress corrosion cracking of titanium alloys were studied using hot-stage microscopy and cinematography. An incubation period for cracking was observed, the duration of which depends on exposure temperature, salt composition, and alloy composition. For Ti-8Al-1Mo-1V exposed to sodium chloride (NaCl) the incubation period decreased from about 96 hr at 475 F, to 20 hr at 500 F, to 11⁄2 hr at 650 F, to only 10 min at 850 F. This same alloy cracked severely in only 20 min at 475 F when exposed to tin chloride (SnCl2) indicating that the apparent "threshold temperature" for cracking is strongly influenced by chemical environment. At 650 F the incubation period for NaCl cracking of four alloys containing aluminum increased with decreasing aluminum content. Cracks appeared abruptly and propagated rapidly for a short distance, then apparently paused for additional corrosion-embrittlement to occur. Moisture was demonstrated to be a vital ingredient in hot-salt attack, and the presence of absorbed hydrogen in salt-corroded areas has been demonstrated using radiotracer tritium (H3). These results support the hypothesis that absorption of corrosion-produced hydrogen promotes embrittlement and crack initiation.
Author: R. S. Ondrejcin
Publisher:
Published: 1971
Total Pages: 36
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DOWNLOAD EBOOKAuthor: Dick M. Royster
Publisher:
Published: 1969
Total Pages: 44
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DOWNLOAD EBOOKSalt stress corrosion cracking effects on tensile and stress rupture properties of titanium alloy sheet.
Author: Hugh R. Gray
Publisher:
Published: 1969
Total Pages: 42
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DOWNLOAD EBOOKAuthor: Thierry Chevrot
Publisher:
Published: 1994
Total Pages:
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DOWNLOAD EBOOKAuthor: Hugh R. Gray
Publisher:
Published: 1971
Total Pages: 68
ISBN-13:
DOWNLOAD EBOOKSusceptibility of titanium alloys to hot-salt stress-corrosion cracking increased as follows: Ti-2Al-11Sn-5Zr-0.2Si(679), Ti-6Al-2Sn-4Zr-2Mo(6242), Ti-6Al-4V(64), Ti-6Al-4V-3Co(643), Ti-8Al-1Mo-1V(811), and Ti-13V-11Cr-3A1(13-11-3). The Ti-5Al-6Sn-2Zr-1Mo-0.25Si(5621S) alloy was both the least and most susceptible depending on heat treatment. Such rankings can be drastically altered by heat-to-heat and processing variations. Residual compressive stresses and cyclic exposures also reduce susceptibility to stress-corrosion. Simulated turbine-engine compressor environmental variables such as air velocity, pressure, dewpoint, salt concentration, and salt deposition temperature have only minor effects. Detection of substantial concentrations of hydrogen in all corroded alloys confirmed the existence of a hydrogen embrittlement mechanism.--P. [i].
Author: R. S. Ondrejcin
Publisher:
Published: 1971
Total Pages: 28
ISBN-13:
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