Effect of heat titanium bar on β titanium organization

β stabilizing element are different degree of reduction of titanium a + β / β transformation point and sequentially tantalum, niobium, molybdenum, vanadium, silicon, copper , chromium, manganese, iron incremented.
β stabilizing element are reduced titanium martensitic transformation start temperature. β stabilizing element is gradually increased , the point M can be reduced to titanium room temperature , the β -phase titanium alloy when rapidly cooled to room temperature region can be retained to a high temperature β -phase temperature . At this point the content of titanium element is critical concentration . titanium standard part Clearly, the critical concentration is the ability of β -phase stability of a measure of alloying elements. Β -stabilizing element Ti alloy phase is based tantalum, niobium, vanadium, tungsten, copper , molybdenum , nickel, cobalt, chromium, manganese , iron in increasing order . Isomorphous β stabilizing element element is weak , the eutectoid type element is stronger .

Titanium Titanium elements on recrystallization temperatures. Except cobalt and niobium , the manganese, iron , titanium vanadium were increased recrystallization temperature.

With the increase of β stabilizing element content , when the alloy rapidly cooled from β -phase region will appear different organizational changes , β stabilizing elements will affect the decomposition of metastable β phase in the aging process , and to type "C" curve to the right goes .

Eutectoid binary β stabilizing element in the form of titanium , there are eutectoid transformation equilibrium phase at room temperature with compounds ( except for tungsten outside ) . With the lower eutectoid reaction temperature , its ability to stabilize β phase is larger, the worse the eutectoid transformation of the active compound of the more difficult the phase appeared . Iron, manganese , tittanium bar chromium and other elements in the analysis of β -phase component that has been retained to room temperature, and generally can not be eutectoid transformation occurs . But like silicon , copper, nickel and other fast -eutectoid elements are not, they are prone to change and generate eutectoid pearlite lamellar organization a + compounds.