Select the aging process titanium bar and titanium alloys

The purpose of titanium and titanium alloy aging treatment is to promote the metastable phase resulting solution treated a certain way decompose , causing strengthened. In general, this process can be described by a "C" type " time - - temperature changes" curve represents the relationship out .titanium axle Shape "C" shaped curve changes depending on the alloy composition . A heat-treatable alloys and a β β stabilizing element content of more binary alloy "C" shaped curve .

Determining an alloy aging process is generally based on age-hardening curve. It describes the different aging temperature , aging time and the relationship between the mechanical properties of the alloy . Mechanical properties of tensile properties at room temperature can also be used hardness or other properties. Select the aging temperature and time should be to get the best overall performance prevail , generally , a + β alloy aging temperature is about 500 ~ 600 ℃, time of 4 to 12 hours ; low alloy can be heat-treated β aging temperature , time long , approximately 450 ~ 500 ℃, 8 ~ 24 hours. Cooling air cooling are used .

In order to control the size of the precipitated phase , morphology and number , but also some multi -stage alloy aging . If TB1 alloy at 450 ℃, time 35 hours after once 560 ℃, 15 minutes time , a time when so produced a fine dispersed phase concentration, improved ductility after aging .

Requires the use of titanium for temperatures better thermal stability , often used in the above aging temperature .titanium wire Some of titanium in order to obtain good toughness and shear performance, but also the use of high temperature aging . This limitation is sometimes called stabilization treatment .

It should be noted , cold and low temperature pre-aging before aging are greatly accelerated the rate of decomposition of metastable β -phase , and to a relative dispersion enhancement . In some special conditions of use, can be heat treated to improve the tensile strength and elastic modulus β titanium alloy by cold deformation after aging treatment .