The effect of internal stress, iron ferrite content and grain size on acoustic velocity
CUI Dong1, HE Xiping1*, LIU Xiaorong1, LU Kang1, HE Shengping2, NI Tao2
(1 School of Physics and Information Technology, Shaanxi Key Laboratory of Ultrasonic, Shaanxi，ChinaShaanxi Normal University, Xi′an 710119, Shaanxi, China;2 11 Subbox, 150 Mailbox, Baoji 721013, Shaanxi, China)
Abstract:
The effect of internal stress, iron ferrite content, grain size on acoustic velocity are investigated.Two different material of stainless steels, 1Cr17Ni2 and 2Cr13, with same material treated under different heat temperatures conditions are taken for examples. Acoustic velocity of different heat treatment temperature of metal materials is measured.The iron ferrite content in the 3Cr13 treated with low temperature is speculated when the phase transition has not occurred. The results show that the longitudinal wave velocity depends on material iron ferrite content, internal stress size and grain size. If the heat treatment temperature does not reach the phase transition temperature, which means that stainless steel is no stress, velocity magnitude mainly depends on ferrite content changes. If the heat treatment temperature is reached, that is, stainless steel has internal stress, velocity size mainly depends on material iron ferrite content, internal stress size and grain size.
KeyWords:
heat treatment; acoustic velocity; internal stress; iron ferrite
