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| Regularity and Reason of Property Aging for SWRH82B High Carbon Hot-Rolling Wire Rod |
| ZHAO Jie1,2,ZHU Shu-hang3,WANG Zhi-qi1,4,YAN Zhen3,NING Bao-qun1,BAO Jun-cheng1 |
1. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
2. Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education, Tianjin 300384, China
3. Tianjin Pre-Stress Steel Wire Co., Ltd., Tianjin 300400, China
4. Tianjin Key Laboratory for Photoelectric Materials and Devices， Tianjin 300384, China |
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Abstract The mechanical properties of large-size 82B high carbon steel wire rod were systemically investigated after natural aging. The microstructure, composition and distribution of inclusions, macro- and micro-fracture morphology, phase structure and residual stress of 82B wire rod were measured and analyzed by means of OM, SEM, EDS and XRD. The results show that area reduction ratio of 82B wire rod increases significantly with the aging time. Aging time required to meet the mechanical properties of 82B wire rod is related to its primary properties and environmental temperature. The distribution of the inclusions is not uniform in 82B wire rod. The fracture morphology of “black core + white point” were found because of existence of larger-size composite brittle inclusions. The release of residual stresses and decrease of lattice distortion are the main reasons for causing the area reduction ratio to improve.
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Received: 06 September 2010
Published: 15 December 2011
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2011, Vol. 46 
