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Qingxiao Zhang,Wei Wang,Qing Yuan,Zhoutou Wang,Zhicheng Zhang,Guang Xu 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.7
The effects of niobium (Nb) on the thermal stability and mechanical properties of a low-carbon ultrafine grain steel (UFG)were investigated. Results indicate that compared to the Nb-free UFG steel, the dissolved Nb in the Nb-UFG steel beforeannealing was beneficial to improve the thermal stability and strength but harmful to plasticity. The grain boundaries movementwas inhibited by numerous Nb(C, N) particles re-precipitated during annealing, leading to the refined ferrite grains,subsequently the higher thermal stability and strength of the Nb-UFG steel. The decreased elongation was attributed to thefiner ferrite grains and coarse Fe3Cparticles. However, the thermal stability and strength of the Nb-UFG steel were alsoenhanced without any elongation sacrifice when Nb was partially dissolved in matrix before annealing. The superior balancebetween strength and ductility is ascribed to the precipitation strengthening of fine Nb(C, N) particles, appropriate ferritegrain size and finer Fe3Cparticles. In addition, although the thermal stability of the steel with completely solute Nb beforeannealing was better than that with partially solute Nb, the strength and elongation of the former decreased due to the inferiorwork hardening ability caused by finer ferrite grains and larger Fe3Cparticles.
Jina Wang, Kaidong Xu,Zhixin Li,Yilong Yang,Qingxiao Li,Yun Bao,Huan Yang,Lingling Ding,Ruixin Zhang,Yuanyuan Wang,Lan Yao 한양대학교 세라믹연구소 2022 Journal of Ceramic Processing Research Vol.23 No.1
In order to effectively reuse red mud and coal gangue, foam glass was successfully prepared by sintering. The foaming of foamglass is ensured by adding foaming agent, foam stabilizer and fluxing agent to the raw materials including red mud, coalgangue and waste glass. Furthermore, the defects in the foam glass are also reduced. The obtained powder was dried at 105ºC and characterized by XRF, DSC-TG analysis, etc. According to cellular structure, apparent density and water absorption,the optimal type and ratio of foaming agent, foaming stabilizer and fluxing agent were revealed. The results indicate that theoptimized formula of foaming agent, foaming stabilizer and fluxing agent is 3% MnO2-2% Na3PO4-2% borax. The foam glassprepared under optimized conditions exhibits uniform porous distribution and suitable pore size with an apparent density of0.575 g/cm3 and water absorption of 4.61%. The research in this work could establish the technical foundation of red mudbasedporous material for industrial production.