Microstructural investigation of SAE 1040 steel specimens by ultrasonic measurements

The aim of this study is to characterise the microstructures of the as-quenched and tempered SAE 1040 steel specimens by sound velocity and attenuation measurements. An initial heat treatment was applied to the specimens to obtain a uniform starting microstructure. Following 850 degrees C/0.5 h austenitisation and water-quenching of all specimens, a tempering process was applied at 200 degrees C and 600 degrees C for 2 h. Microstructures of the specimens were characterised first by metallography and hardness measurements. Then, the velocities of both longitudinal and transversal waves were measured. Backwall echo patterns were obtained to compare the attenuation behaviour. By using the specimens having the same thickness, and by eliminating the effects of grain size and texture, only the influence of microstructural phases on sound velocity and attenuation was investigated. Sound velocity increased as a function of tempering temperature, however no meaningful variation in sound attenuation was observed.


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The structural and electronic properties of BN and BP compounds and BNxP1-x alloys have been investigated by full potential linearized augmented plane wave (FP-LAPW) method based on density functional theory (DFT). The total energies and electronic band structures of these compounds have been calculated for different approximations of exchange-correlation energy. The comparative study has showed that the Perdew-Wang-generalized gradient approximation (PW-GGA) is the best one to produce the measured structur...
Citation Formats
C. H. Gür, “Microstructural investigation of SAE 1040 steel specimens by ultrasonic measurements,” INSIGHT, pp. 421–424, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47265.