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Microstructure and mechanical properties of an oxide dispersion strengthened ferritic steel by a new fabrication route

机译:一种新的制备工艺对氧化物弥散强化铁素体钢的组织和力学性能的影响

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摘要

A reduced activation oxide dispersion strengthened (ODS) ferritic steel with nominal composition of Fe-12Cr-2.5W-0.25Ti-0.2V-0.4Y_2O_3 (designated 12Cr-ODS) was produced by using EDTA-citrate complex method to synthesize and add Y_2O_3 particles to an argon atomized steel powder, followed by hot isostatic pressing at 1160℃ for 3h under the pressure of 130MPa, forging at 1150℃, and heat treatment at 1050 ℃ for 2 h. The microstructure, tensile, and Charpy impact properties of the 12Cr-ODS steel were investigated. Transmission electron microscopy studies indicate that the 12Cr-0DS steel exhibits the characteristic ferritic structure containing few dislocations. Tensile characterization has shown that the 12Cr-ODS steel has superior tensile strength accompanied by good elongation at room temperature and 550 ℃. The material exhibits very attractive Charpy impact properties with upper shelf energy of 22 J and a ductile-to-brittle transition temperature (DBTT) of about -15 ℃ The formation of small, equiaxed grains and fine dispersion of oxide particles are the main reasons for the good compromise between tensile strength and impact properties.
机译:采用柠檬酸乙二胺四乙酸络合物络合法合成并添加了Y_2O_3,制备了标称成分为Fe-12Cr-2.5W-0.25Ti-0.2V-0.4Y_2O_3的还原型活性氧化物弥散强化铁素体钢(命名为12Cr-ODS)。颗粒成氩气雾化的钢粉,然后在130MPa的压力下于1160℃热等静压3h,在1150℃锻造,并在1050℃热处理2 h。研究了12Cr-ODS钢的组织,拉伸性能和夏比冲击性能。透射电子显微镜研究表明,12Cr-0DS钢表现出特征性的铁素体结构,几乎没有位错。拉伸特性表明,12Cr-ODS钢具有优异的拉伸强度,在室温和550℃时具有良好的伸长率。该材料表现出非常诱人的夏比冲击性能,其上架能量为22 J,韧性至脆性转变温度(DBTT)约为-15℃。形成小而等轴的晶粒以及氧化物颗粒的精细分散是产生这种现象的主要原因拉伸强度和冲击性能之间的良好折衷。

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