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| Effect of hot-rolled coiling temperature on microstructure，properties and textures of micro-carbon deep-drawing DP steel |
| YE Jie-yun1，AN Gui-huan1， LIU Shan-shan1，LIU Wei-ning2，WANG Zhi-gang1 |
（1. School of Material Science and Engineering，Jiangxi University of Science and Technology，Ganzhou 341000，Jiangxi，China
2. AC Construction Branch，State Grid Corporation of China，Beijing 100031，China） |
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Abstract In order to study the charge rule of texture on deep-drawing DP steel， effect of hot-rolled coiling temperature on microstructure， properties and textures of micro-carbon deep drawing DP steel were studied by OM，TEM and XRD technical. The research shows that： microstructure of hot-rolled plates is mainly composed of ferrite and pearlite. With the increasing of coiling temperature， the grain size of ferrite increased slightly， and elongation of hot-rolled plate enhanced gradually. The optimum precipitation temperature of Mo-based carbide in hot-rolled plate is 700 ℃. A higher volume fraction (4%) of martensite and finer (11.7 μm) ferrite observed in annealed sheet on 700 ℃ coiling compared with 650 and 750 ℃. Meanwhile， the strongest 〈111〉//ND fiber texture and weakest {001}〈110〉 texture achieved in annealed sheet. The tensile strength and r value of annealed sheet on 700 ℃ coiling reach to 455 MPa and1.5， respectively.
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Received: 23 May 2016
Published: 09 December 2016
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2016, Vol. 51 
