Assessing the Hardness of Quenched Medium Steel Using an Ultrasonic Nondestructive Method

doi:10.1155/2015/684836

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题名:	Assessing the Hardness of Quenched Medium Steel Using an Ultrasonic Nondestructive Method
作者:	Hsia, Shao-Yi Chou, Yu-Tuan
贡献者:	應用空間資訊系
关键词:	Grain-sizedetermination Attenuation Marbles Welds
日期:	2015
上传时间:	2016-04-19 19:00:41 (UTC+8)
出版者:	Hindawi Publishing Corporation
摘要:	Developing new materials or improving their heat treatment techniques is key to industrial upgrades for increasing fastener product quality. Nowadays, high tensile strength bolts are heat-treated to achieve desired mechanical properties such as hardness, strength, toughness, and resistance to fatigue and wear. Ultrasound detection is one widely used nondestructive inspection technique. Based on the characteristics of wave transmission, the refraction, diffraction, and scattering of ultrasound wave velocity and attenuation in a material are governed by its grain boundary characteristics. In this study, C1045 middle carbon steel was heat-treated at various temperatures and then water-quenched, and the relationships among grain size, ultrasonic velocity, attenuation, and material hardness were then determined using two ultrasound sources. Our experimental results show that a smaller average grain size as well as higher hardness can be obtained from higher quenching temperatures. Faster acoustic velocities and slower attenuation coefficients are caused by higher material hardness. A scattering effect is more obvious for higher transducer frequencies. Our results demonstrate another nondestructive test that can assess the quenching process in the fastener industry.
關聯:	Advances In Materials Science And Engineering, v.2015, Article ID 684836,8 pages
显示于类别:	[Dept. of Applied Geoinformatics] Periodical Articles

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