Nonlinear ultrasonic assessment of precipitation hardening in ASTM A710 steel
Nonlinear ultrasonic assessment of precipitation hardening in ASTM A710 steel
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DOI：
10.1557/jmr.2000.0292
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发表时间：
2000-09-01
影响因子：
2.7
通讯作者：
Purtscher, PT
中科院分区：
文献类型：
--
作者：
Hurley, DC;Balzar, D;Purtscher, PT
我们研究了几个试样的ASTM A710钢含有富铜沉淀物的变化，在最终的时效处理。X射线衍射谱线展宽和小角度中子散射实验揭示了沉淀物和相关的相干应变的存在。我们通过谐波产生实验确定了每个样品的非线性超声参数β，并测量了超声纵向速度uppermost（L）和衰减alpha（L）。虽然上升（L）和或，没有表现出一致的趋势，β随应变增加。这种相关性相比，微观结构模型的谐波产生，包括从沉淀钉扎位错的贡献。
We investigated several specimens of ASTM A710 steel containing copper-rich precipitates with variations in the final aging treatment. X-ray diffraction line-broadening and small-angle neutron-scattering experiments revealed the existence of the precipitates and associated coherency strain. We determined the nonlinear ultrasonic parameter beta for each specimen by harmonic-generation experiments and measured the ultrasonic longitudinal velocity upsilon(L) and attenuation alpha(L). Although upsilon(L) and or, showed no consistent trends, beta increased with increasing strain. This correlation is compared to a microstructural model for harmonic generation that includes a contribution from precipitate-pinned dislocations.