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| Effect of hot/warm roll-forming process on microstructural evolution and mechanical properties of local thickened U-rib for orthotropic steel deck |
| Xue-feng Peng1,Jing Liu1,*,Jing-tao Han1,Dong-bin Wei2 |
1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 School of Electrical, Mechanical and Mechatronic Systems, Faculty of Engineering and Information Technology, University of Technology Sydney, Sydney 2007, NSW, Australia |
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Abstract To improve the strength-toughness of traditional U-rib (TUR) and solve the problem of insufficient penetration between TUR and deckplate, a new local thickened U-rib (LTUR) has been proposed to improve the fatigue resistance of the weld joint under the premise of not increasing thickness and strength of the TUR material. And a hot/warm roll-forming process (RFP) adopting partially induction heating to 700-1000��C was carried out to fabricate LTUR. The deformation behaviors in the forming process and microstructure of LTUR have been investigated. Mechanical properties and fracture mechanism of the LTUR after hot/warm RFP have been systematically discussed. Moreover, the results are compared with those obtained in cold RFP. Mechanical properties of the LTUR deformed above the critical transformation temperature (Ac3) show high performance characteristics with marked fatigue resistance and superior toughness. Upon increasing the heating temperature from 700 to 900��C, the initial coarse ferrite-pearlite structure transform into equiaxed ultrafine ferrite (1-3 ��m) and precipitates such as (Nb,Ti)(C,N) are uniformly distributed in the matrix. The average dislocation density of the specimens after hot roll-forming at heating temperature of 900��C decreases dramatically compared with those of the specimens subjected to the cold RFP. Furthermore, a typical characteristic of ductile fracture mechanism and the high impact energy are more convinced that the specimens deformed above 900��C have obtained an optimal combination of strength and toughness.
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Received: 25 July 2016
Published: 20 March 2017
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| [1] |
Zhao-xia Shi,,*,Xiao-feng Yan,Chun-hua Duan,Jin-gui Song,Ming-han Zhao,Jue Wang. Hot deformation behavior of GH4945 superalloy using constitutive equation and processing map[J]. Chinese Journal of Iron and Steel, 2017, 24(6): 625-633. |
| [2] |
Zhong-liang Tian,,Sen-bao Jiang,Zheng-zong Chen,Han-sheng Bao,Zheng-dong Liu,*. Microstructural evolution and mechanical properties of a new Ni-based heat-resistant alloy during aging at 750��C[J]. Chinese Journal of Iron and Steel, 2017, 24(5): 513-519. |
| [3] |
Fu-ming LIU,Jian-jun WANG,,Yu-jie LIU,R.D.K. MISRA,Chun-ming LIU,. Effects of Nb and V on Microstructural Evolution, Precipitation Behavior and Tensile Properties in Hot-rolled Mo-bearing Steel[J]. Chinese Journal of Iron and Steel, 2016, 23(6): 559-565. |
| [4] |
Hua- dong FU,Yuan- ke MO,Long- chao ZHUO,Zhi- hao ZHANG,Jian- xin XIE. Effect of Deformation Temperature on Deformation Mechanism of Fe- 6. 5Si Alloys with Different Initial Microstructures[J]. Chinese Journal of Iron and Steel, 2016, 23(4): 344-349. |
| [5] |
Ke-lu WANG,Shi-qiang LU,Xian-juan DONG,Xin LI,De-lai OUYANG. Deformation Behavior of Ti-5.6Al-4.8Sn-2.0Zr-1.0Mo-0.35Si-0.85Nd Alloy in ��/Quasi-�� Forging Process[J]. Chinese Journal of Iron and Steel, 2016, 23(12): 1297-1302. |
| [6] |
Ying KAN,,Shi-hong ZHANG,Li-wen ZHANG,Ming CHENG,Hong-wu SONG,Hong-wei LU. Healing Behavior of Micropores in Powder Metallurgy 316L Stainless Steel during Hot Forging and Heat Treatment[J]. Chinese Journal of Iron and Steel, 2014, 21(9): 862-868. |
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2017, Vol. 24 
