Titanium Rods Have Cracks What Is Going On?

In the production of titanium rods, the production of materials by rolling production, flaw detection did not see defects. And in the use of a shorter period of time will be found on the surface of the micro-cracks, affecting the use of the effect. May I ask you what is the main reason for this and how should I go about analyzing it. And how does the different organization of titanium alloy affect the propagation of ultrasonic waves in it?

Should be rolled orientation or have a near-surface has broken thermal shear band, the general situation in the ultrasonic action of the alloy along the grain boundaries or phase boundaries off. Do not know the grade and rolling process and specifications of the alloy of titanium rods, the specific cause can not be determined. This is due to rolling before the opening of the billet forging, pier pulling times is not enough, that is, the amount of deformation is not enough, resulting in the grain is not completely refined, and the rolling process will make the material properties of the anisotropy increases, you only said the end of the finished product after the temperature and specifications, the front of the process is the key to affect the performance of the key, such as composition, forging, pier pulling process, the amount of deformation of each fire, as well as the end of the heat treatment after the temperature and time. time.