The effect of impact ultrasonic treatment (UT) on the structure and properties of welded joint in 12Kh1MF heat resistant steel widely used in thermal power engineering for the manufacture of pipes was studied. It was found that cold hardening occurs and there is a change in the main structural components. Strength characteristics increased by 2-3%, the surface hardness by 25-30%, the cyclic lifetime of the weld by a factor of 4-5 and also the ultimate strength of the base metal. A main fatigue crack formed in the region of the sample flute as a result of the formation of compressive stresses and an increase in the fatigue strength of the weld to the level of the base metal.
|Number of pages||9|
|Publication status||Published - 2000|
ASJC Scopus subject areas
- Acoustics and Ultrasonics