Evolution of internal friction in low-carbon steel during vibratory stress relief

Journal of Materials Research and Technology

Weite Wu¹  Hsuan-Han Lai²  Hao-Chun Cheng²  Sheng-Hao Su²  Chi-Ming Lin² 

[1] Corresponding author.;National Chung Hsing University, Department of Materials Science and Engineering, 145 Xingda Road, South Dist., Taichung City 402, Taiwan R.O.C;

关键词: VSR;    Internal friction;    Dynamic mechanical analyzer;   

DOI  :  

来源: DOAJ

【 摘 要 】

Vibratory stress relief has been reported to induce crystal lattice movements, which are forms of the internal friction of a material. In this study, low-carbon steel specimens were vibrated to analyze the evolutions of their internal frictions and stress-relieving effects. Specific vibration frequencies were found to produce relatively higher internal frictions and stress-relief ratios. For a fixed vibration frequency, higher vibrational amplitudes were found to induce higher internal frictions. When vibrated for the same amount of time but at varying amplitudes, the internal frictions of the specimens either decreased with time (which indicates the effects of stress relief) or increased with time and fracturing the specimen owing to fatigue. These results indicate that the increasing of internal friction could serve as an index for fatigue crack nucleation in low-carbon steel.

【 授权许可】

Unknown