Effect of Hydrogen on Industrial Plasticity of Alloy Ti + 9%A1,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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Up to now, hydrogen has only been considered as a harmful impurity which causes hydrogen brittleness. However, in 1957 Zwicker and Walter established that the addition of hydrogen to titanium alloys raises their plasticity in the hot state. They studied alloys of Ti with 8, 10 and 13 by mass aluminum. Alloys with such a high aluminum content are of great practical interest since these can be used at temperatures which are unusually high for titanium. Unfortunately, titanium alloys which contain more than 7.5 Al have low technological effectiveness and fracture during hot working. Alloying alloys of the Ti-Al system with hydrogen has made it possible to overcome this defect. With a hydrogen content of 0.505 by mass, a billet made of a titanium alloy with 8 Al was upset at 950 deg to 78 without crack formation. The billet which did not contain hydrogen fractured under the same conditions. The titanium alloys containing 13 Al was saturated with hydrogen to 0.24. At 950 deg and a deformation ratio of 69, insignificant spalling was observed on the upset billet. In this case, the billet which did not contain hydrogen was completely destroyed during forging. However, not one study has been published in this area since 1957. The purpose of this research was to study the technological plasticity of a titanium alloy alloyed with 9 Al in a broad range of hydrogen contents 0.006-0.3 weight at hot working temperatures. Keywords Translations USSR Foreign technology.
- Metallurgy and Metallography