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铁素体不锈钢晶粒度的非线性超声表征

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Indexed by:期刊论文

Date of Publication:2018-07-10

Journal:无损检测

Volume:40

Issue:7

Page Number:15-18,81

ISSN No.:1000-6656

Key Words:铁素体不锈钢;晶粒度;非线性参数;表征

Abstract:利用非线性超声检测技术,测量了不同晶粒尺寸铁素体不锈钢的非线性参数,并与传统线性超声技术的评估结果进行了比较.结果表明,随着铁素体不锈钢晶粒尺寸的增大,声速变化并不明显,相对变化量为1.89%,衰减系数的相对变化量也只有5.65%,而非线性参数随晶粒尺寸的增加而持续减小,这是由于声波在材料内的传播过程中,其非线性效应很大一部分产生在晶界等不连续处,随着晶粒尺寸的增大,晶界面积减小,非线性效应减弱.

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