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Journal of Iron and Steel Research International 2011年第S1期18卷 14-21页

作者： garc.a c.issac.suikkanen pasi p Deardo Anthony J Basic Metals processing Research Institute Department of Mechanical Engineering and Materials ScienceUniversity of PittsburghPittsburghPA 15261USA Department of Mechanical Engineering University of OuluBox 420090014 OuluFinland

The addition of microalloying elements (MAE) to low c-Mn-Si HSLA steels has led to many benefits to the producers,fabricators and *** improvements such as microstructural refinement,higher dislocation and sub-grain boundary densities and finer M-A-c distributions have led to higher strength,improved toughness and better *** improvements can often be traced to the MA *** steels for load-bearing applications,the combination of MAE with hardenability additions (cr,Mo,B,etc.) and lower transformation temperatures has led to much higher strength levels than what were available a few years *** resulting nonpolygonal,bainitic and martensitic ferrite microstructures have not only higher strengths but also adequate levels of improved ductility and *** strip,plate and pipe applications have benefitted from these *** improvements have been found in the microalloyed forging steels,where the change from pearlite-ferrite to bainitic ferrite microstructures has led to higher strengths and improved high-cycle fatigue resistance,with little penalty in ductility and *** the cold rolled gauges,both the so-called Advanced High Strength Steels (Dp,TRIp and complex phase Steels) and the martensitic direct-quenched and press-quenched steels,along with the Interstitial-Free steels,have benefited from MAE additions,especially in the very popular zinc-coated sheet *** paper will briefly review each of these topic areas,and the underlying physical metallurgy will be discussed.

关键词： microalloying vanadium HSLA steels bainite,linepipe thermomechanical processing

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crystallographic Analysis of Isothermally Transformed Bainite in 0.2c-2.0Mn-1.5Si-0.6cr Steel Using EBSD

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Journal of Materials Science & Technology 2013年第4期29卷 359-366页

作者： pasi p.suikkanen cyril cayron Anthony J.DeArdo L.pentti Karjalainen Ruukki Metals Oy Rautaruukintie 155P.O.Box 93FI-92101 RaaheFinland Department of Mechanical Engineering University of OuluP.O.Box 420090014 University of OuluFinland Ruukki Metals Oy Rautaruukintie 155P.O.Box 93FI-92101 RaaheFinland. cEA LITEN17 rues des Martys38054 GrenobleFrance Department of Mechanical Engineering and Materials Science University of Pittsburgh848 Benedum HallPittsburghPA 15261-2285USA

The crystallography of bainite, transformed isothermally at 450 ℃ in 0.2c-2.0Mn-1.5Si-0.6cr steel, was investigated by electron backscatter diffraction （EBSD） analysis. The orientation relationship （OR） was found to be closer to Nishiyama-Wassermann （N-W） than Kurdjumov-Sachs orientation relationship. Bainite microstructure consisted of parallel laths forming a morphological packet structure. Typically, there were three different lath orientations in a morphological packet. These orientations were dictated by a three specific N-W OR variants sharing the same {111} austenite plane. A packet of bainite laths with common {111} austenite plane was termed as crystallographic packet. Generally, the crystallographic packet size corresponded to the morphological packet size. Locally, crystallographic packets with only two dominant orientations were observed. This indicates strong local variant selection during isothermal bainite transformation. The relative orientation between the variants in crystallographic packets was found to be near 60°/〈110〉. This appears to explain the strong peak observed in the grain boundary misorientation distribution near 60°. Bainite also contained pronounced fraction of boundaries with their misorientation in the range of 2.5°-8° with quite widely dispersed rotation angles. Spatially these boundaries were found to locate inside the bainite laths, forming lath-like sub-grains.

关键词： Bainite Austenite Nishiyama-Wassermann orientation relationship Electron backscatter diffraction OEBSD) crystallography packet

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crystallographic Analysis of Martensite in 0.2c-2.0Mn-1.5Si-0.6cr Steel using EBSD

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Journal of Materials Science & Technology 2011年第10期27卷 920-930页

作者： pasi p.suikkanen cyril cayron Anthony J.DeArdo L.pentti Karjalainen Department of Mechanical Engineering University of OuluBox 420090014 University of Oulu cEA LITEN17 rues des Martys38054GrenobleFrance Department of Mechanical Engineering and Materials Science University of Pittsburgh

The crystallography of martensite formed in 0.2c-2.0Mn-1,5Si-0.6cr steel was studied using the electron backscattered diffraction （EBSD） technique. The results showed that the observed orientation relationship （OR） was closer to that of Nishiyama-Wassermann （N-W） than Kurdjumov-Sachs. The martensite consisted of parallel laths forming morphological packets. Typically, there were three different lath orientations in a morphological packet consisting of three specific N-W OR variants sharing the same {111} austenite plane. A packet of martensite laths with a common {111} austenite plane was termed a crystallographic packet. Generally, the crystallographic packet size corresponded to the morphological packet size, but occasionally the morphological packet was found to consist of two or more crystallographic packets. Therefore, the crystallographic packet size appeared to be finer than the morphological packet size. The relative orientation between the variants in crystallographic packets was found to be near 60°〈110〉, which explains the strong peak observed near 60° in the grain boundary misorientation distribution. Martensite also contained a high fraction of boundaries with a misorientation in the range 2.5-8°. Typically these boundaries were found to be located inside the martensite laths forming sub-laths.

关键词： Martensite Austenite Nishiyama-Wassermann orientation relationship EBSD crystallography packet

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