Studying the Changes in the Pressure Transmission Coefficient of the Ultrasonic Waves for Ferrous and Non-Ferromagnetic Alloys to Find Some of the Most Significant Mechanical Properties

This study is the most important part of the technique of using the pressure transmission coefficient (PTC) of the ultrasonic waves in extracting the most important mechanical properties (yield stress and ultimate strength) of alloys in general. In this study, 48 alloys were tested. For scientific reasons mentioned in this study, such as Magnetomechanical acoustic emission, the alloy's behavior with the PTC values of the ultrasonic waves, and others, these alloys were classified into several levels. The alloys at the first level were classified into ferromagnetic and non-ferromagnetic alloys (12 alloys of non-ferromagnetic). In the second level, ferromagnetic alloys were classified into nickel alloys (8 alloys) and steel alloys. At the third level, these steel alloys were classified into stainless steel alloys and a group of plain carbon steel and low-alloy steels (10 alloys). Finally, stainless steel was classified into austenitic steel alloys (10 alloys), and a group of alloys (martensitic, duplex, and ferritic alloys) (8 alloys). The accuracy of these results ranged between 80 ~ 99% compared to ASTM values. This percentage excludes alloys that suffer a phase transformation during tensile testing, such as alloy TiC and others. The results proved that the behavior of the values of PTC changes with a change in the percentage of carbon in carbon steel alloys. On the other hand, there is a difference in PTC values behavior with the austenitic stainless-steel alloys than with a group of stainless-steel alloys (martensitic, duplex, and ferritic alloys), in addition to many conclusions included in this study.