Heat treatment of titanium and titanium plate changes during cooling

When titanium and titanium alloy is heated to β phase, polymorphic transition a → β will occur. This process is also sometimes referred to as recrystallization. The highly pure titanium a → β transition temperature of 875 + -5 ℃. But until the β-phase fully formed, it is difficult to observe this process by optical method. In the low temperature phase β of the reason is unclear. But the experiment indicated,titanium stockist a mutual transition and β, either heating or cooling, a phase and β phase always maintain a certain Bragg Sites of the relationship. Polymorphic transformation of titanium when heated little research to date.

1 change in the slow cooling of titanium and titanium alloys
When titanium and titanium alloy is slowly cooled from β-phase region to a + β phase region, β → a polymorphic transformation to happen. In the high-titanium has been confirmed at this time of nucleation is a martensitic phase, and then grow by thermal activation process. When nucleation of the embossed surface of the sample usually also the martensitic transformation, but also to maintain a strict phase Sites of the Bragg relationship between the parent.

2. Changes in the rapid cooling of the
Changes and changes in product titanium and titanium alloy occurs when rapid cooling from the β phase region with changes in β stabilizing element content is different.

Martensitic transformation: 1.a `massive martensite orientation relationship can not be measured; acicular martensite and β phase to maintain a` Bragg Sites of the relationship habit plane is (334) β or (344 ) β. 2.a "in Ti-Mo, Ti-W, Ti-Re was found, but the Ti-V system did not; a" lattice parameter with composition changes; a "titanium plastic is reduced.

Phase formation quenching ω: ω is the size of small particles by electron microscopy observations only;titanium standard parts ω elastic modulus and hardness, the plastic drop.