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Explore the Strengthening Mechanisms of the ultra-low carbon and low Alloy Steel

Journal of Iron and Steel Research International 2011年第S1期18卷 346-349页

作者： LIU Pan 1,2,LI Hong-mei 1,2,LIU Rong-pei 1,BAO Yao-zong 2 (1.Kunming University of Science and Technology Kunming,Yunnan 650093,China 2.Central Iron and Steel Research Institute,Beijing 100081,China) Kunming Univ Sci & Technol Kunming 650093 Yunnan Peoples R China Cent Iron & Steel Res Inst Beijing 100081 Peoples R China

Room temperature tensile tests were carried on the hot-rolled state ultra-low carbon and low alloy cabainite and martensite steels which were get by different finishing temperatures and different cooling *** used the Scanning Electron Microscopy (SEM),Electron Backscattered Diffraction (EBSD) and X-Ray Diffractometer (XRD) to identify the metallographic structure and analyse the precipitated *** inherent mechanism of high strength of ultra-low carbon and low alloy bainite and martensite steels was discussed,and the analysis indicated that the reinforcement of ultra-low carbon and low alloy bainite and martensite steels was mainly produced by the superposition of the dislocation strengthening,solution strengthening and grain refinement strengthening.

关键词： ultra-low carbon low alloy bainite martensite steel dislocation strengthening solution strengthening fine-grain strengthening precipitation strengthening

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Effect of Overaging on Solute Distributions and Bake Hardening Phenomenon in Bake Hardening Steels

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Journal of Iron and Steel Research International 2012年第1期19卷 53-59页

作者： WANG Hua SHI Wen HE Yan-lin LU Xiao-gang LI Lin College of Materials Science and Engineering Shanghai UniversityShanghai 200072China State Key Laboratory of Development and Application Technology of Automotive(BaoSteel) Shanghai 201900China

Specimens of two different kinds of bake hardening steels （BH-Mn and BH-P） were prepared and treated with different annealing processes （water quenching and overaging）. A novel technique of three dimensional atom probe was used to investigate solute distributions in these steels. The results indicate that C concentration decreases, whereas V increases during overaging in both bake hardening steels. The conclusion that no vanadium carbides pre- cipitate during the overaging is therefore originally obtained by microanalysis in bake hardening steels. Moreover, bake hardening values of all the specimens were tested by tensile experiments with 2 0/~ pre-deformation. However, those of overaged specimens were further measured with higher levels of pre-deformation because no bake hardening phenomenon was present at 2% pre-deformation. As the pre-deformation increases from 2% to 6% and 8%, both overaged steels show bake hardening values, and the value data are almost the same.

关键词： ultra-low carbon bake hardening steel three dimensional atom probe solute C water quenching overaging bake hardening phenomenon

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