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Carbide dissolution and austenite grain growth behavior of a new ultrahigh-strength stainless steel

Journal of Iron and Steel Research(International) 2020年第6期27卷 732-741页

作者： Zhen-bao Liu Xin Tu Xiao-hui Wang Jian-xiong Liang Zhi-yong Yang Yong-qing Sun Chang-jun Wang Institute for Special Steel Institute Central Iron and Steel Research InstituteBeijing 100081China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The isothermal grain growth behavior for a new ultrahigh-strength stainless steel (UHSSS) is investigated in temperature range from 900 to 1150 ℃ and holding time range from 0 to 20 min. In the temperature range from 1000 to 1050 ℃, a bimodal grain size distribution was induced by different austenite grain growth rates which resulted from the weakened pin-ning effect by the partial dissolution of M6C particles along austenite grain boundaries. Further raising heating temperatures, M6C particles almost dissolved and the bimodal grain size distribution phenomenon became weakened, indicating that the austenite grain coarsening temperature of the new UHSSS was close to 1050 ℃. According to the present experimental results, a pragmatic mathematical model based on the Arrhenius equations was developed to predict the austenite grain growth process, which elaborated the influence of heating temperature, holding time and initial grain size on the austenite grain growth. Predictions for the new UHSSS presented a good agreement with experimental results.

关键词： Ultrahigh-strength stainless steel austenite grain growth Mathematical model M6C particle

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Austenitization Behaviors of X80 Pipeline Steel With High Nb and Trace Ti Treatment

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Journal of Iron and Steel Research(International) 2009年第6期16卷 58-62页

作者： LIU Qing-you SUN Xin-jun JIA Shu-jun ZHANG Lu-lin HUANG Guo-jian REN Yi Central Iron and Steel ReseaTch Institute Beijing 100081 China Anshan Iron and Steel Group Corporation Anshan 114021 Liaoning China

The austenitization behaviors of two high niohium-containing X80 pipeline steels with different titanium contents, including the dissolution of microalloying precipitates and the austenite grain growth, were investigated by using physical-chemical phase analysis method and microstructural observation. The results illustrated that most niobium could be dissolved into austenite during soaking at 1 180 ℃, whereas little amount of titanium could be dissolved. It was found that during soaking, the austenite grain growth rate was initially high, and then decreased after soaking for 1 h; moreover, the austenite grains grew up more rapidly at temperatures above 1 180 ℃ than below 1 180 ℃. The results show that the steel with titanium content of 0. 016% has a larger austenite grain size than that with titanium content of 0. 012% under the same soaking conditions, which is explained by considering the particle size distribution.

关键词： high Nb steel X80 pipeline steel austenite grain growth dissolution microalloying precipitate

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Effect of Niobium on Transformations From austenite to Ferrite in Low Carbon Steels

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Journal of Iron and Steel Research(International) 2011年第S1期18卷 208-212页

作者： Parker Sally Rose Andrew West Geoff Thomson Rachel Steel Metallurgy Department Tata Steel RD and TSwinden Technology CentreRotherhamS60 3ARUK Department of Materials Loughborough UniversityLoughboroughLE11 3TUUK

Niobium has an important effect on the transformation behaviour,grain size refinement and precipitation strengthening during hot rolling and subsequent cooling in low carbon steels,with even a low content of niobium having a strong effect on the transformation rate from austenite to ***,the effects of niobium on transformation behaviour have not been fully characterised and understood to *** paper examines in detail austenite grain growth as a function of austenitisation time in high strength low alloy (HSLA) steels with three different niobium contents,together with the effect of niobium on the isothermal transformation kinetics from austenite to ferrite as a function of *** is shown that austenite has the slowest grain growth rate in the steel with the highest niobium *** austenite grain sizes are consistent,the steel with the highest niobium content was found to have the slowest transformation rate from austenite to ferrite.

关键词： niobium transformation kinetics austenite grain growth low carbon steels

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