CALCULATION OF THE EFFECT OF TEXTURE ON THE SNOEK PEAK HEIGHT IN STEELS

Contrary to the effect of substitutional atoms and grain size, the inf luence of crystallographic texture on the Snoek peak height of carbon and nitrogen in internal damping experiments rarely has been considere d quantitatively. Therefore, in this paper the orientation dependence of the Snoek peak height (Q(max)(-1)) of carbon and nitrogen is calcul ated both for the very popular torsion pendulum (operating at about 1 Hz) and for the recently developed Automated Piezoelectric Ultrasonic Composite Oscillator Technique (APUCOT), working with longitudinal res onation at 40kHz. The distribution function of the calculated proporti onality factor K-Q (=Q(max)(-1)/C-i; C-i is the interstitial concentra tion) is represented in the Euler space, facilitating not only the int erpretation of the results, but also the calculation of K-Q for experi mentally measured textures. The latter can be done by making the convo lution product of the orientation distribution function (ODF) of the m easured texture and the distribution function of K-Q. The K-Q-values o f the most important texture components and fibers of low carbon steel s are calculated and compared with the ranges of the experimentally de termined proportionality factors found In the literature for anelastic relaxation by carbon and nitrogen atoms.