In this study, the characteristic acoustoelastic behaviors of SKD61 hot die steel were revealed, which is useful for nondestructive evaluation technique of die casting mold in view of the Internet of Things (IoT). The measurement principle was investigated from the acoustoelastic effect of diffracted shear horizontal (SH) waves caused by slight increase in elastic modulus and rapid relaxation of residual stress, which accompany the bct-to-bcc phase transformation.

中文翻译：

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压铸模具退化无损评估退火过程中 SKD61 的声弹性行为

本研究揭示了 SKD61 热模具钢的特征声弹性行为，这对于基于物联网 (IoT) 的压铸模具无损评估技术是有用的。测量原理是从伴随 bct 到 bcc 相变的弹性模量略有增加和残余应力快速松弛引起的衍射剪切水平 (SH) 波的声弹性效应进行研究的。