Nitrogen, oxygen, carbon , boron, titanium have increased a + β / β phase transition temperature . Content within the predetermined range , an increase of 0.01% each of the a + β / β transformation point values were increased 5.5 ℃, 2.0 ℃, 2.0 ℃ ( more than 0.15 % of the total content of 0.15 ℃), 1.0 ℃, press nitrogen, oxygen ,titanium wire carbon, boron descending order . In terms of the content of titanium and titanium alloys maximum allowable calculated ( N <0.05% , carbon < 0.10% ) , the impact on the phase transition temperature on by oxygen , nitrogen, carbon descending order . Oxygen, nitrogen, carbon , boron, titanium starts can increase the recrystallization temperature .
Oxygen and nitrogen will promote the decomposition of metastable β phase , so that "C" shaped curve to the right goes . In addition, oxygen can promote the ω phase volume percentage.
Nitrogen, oxygen , carbon, titanium have increased the tensile strength at room temperature . By its strengthening effect of nitrogen , oxygen, carbon descending order . They will have an impact on the annealed titanium iodide room temperature tensile properties . Oxygen , nitrogen exist, the highest reinforcing effect , a carbon , oxygen, while adding the weakest effect .
Nitrogen, oxygen, carbon , boron, titanium can improve the elastic modulus , the maximum impact of carbon and boron . In addition to boron addition , oxygen , nitrogen, carbon impurity elements are titanium and titanium alloys . Therefore , all the provisions of their highest levels . For titanium alloy for low temperature applications due to oxygen , nitrogen and carbon in the titanium alloy can be improved plastic - brittle transition temperature , their contents should be minimized , especially the oxygen content . "ELI" grade titanium abroad for low temperatures ,titanium pipe meaning that the gap element content is lower .
Boron as alloying elements can not only improve the elastic modulus , and can refine the grain , usually in order to trace the use of titanium alloys .
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