The Effect of Residual Stress on the Distortion of Gray Iron Brake Disks

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• 作者：M. W. Shin (1)
  G. H. Jang (1)
  J. K. Kim (2)
  H. Y. Kim (2)
  Ho Jang (1)
  
• 关键词：automotive ; cast irons ; heat treating ; tribology
• 刊名：Journal of Materials Engineering and Performance
• 出版年：2013
• 出版时间：April 2013
• 年：2013
• 卷：22
• 期：4
• 页码：1129-1135
• 全文大小：560KB
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• 作者单位：M. W. Shin (1)
  G. H. Jang (1)
  J. K. Kim (2)
  H. Y. Kim (2)
  Ho Jang (1)
  
  1. Department of Materials Science and Engineering, Korea University, 1, 5-ga, Anam-dong, Sungbuk-gu, Seoul, 136-713, Republic of Korea
  2. R&D Division, Hyundai Motor Company and Kia Motors Corporation, Hwaseong-si, Gyeonggi-Do, 445-706, Republic of Korea
  
• ISSN：1544-1024

文摘

Thermal distortion of gray iron brake disks due to residual stress and its effect on brake vibrations were studied. The residual stress of heat- and non-heat-treated gray iron disks was measured using neutron scattering. Dynamometer tests were performed to measure the friction force oscillation caused by the disk runout during brake applications. High-temperature tensile tests were carried out to find out possible plastic deformation due to residual stress during brake applications. The results showed that the average residual stress of the heat-treated disk (47.6聽MPa) was lower than that of the non-heat-treated disk (99.6聽MPa). Dynamometer tests at high temperatures (up to 600聽掳C) indicated that the residual stress pronounced the runout: the increase in disk runout after the tests for the non-heat-treated sample was more than twice that for the heat-treated sample. This difference correlated well with the neutron scattering results and the dimensional changes after a separate vacuum heat treatment. The high-temperature tensile tests showed severe reductions in yield strength at 600聽掳C, suggesting that disks produced with no stress relaxation could be deformed during severe braking.