Microstructure and mechanical properties of an oxide dispersion strengthened ferritic steel by a new fabrication route
Microstructure and mechanical properties of an oxide dispersion strengthened ferritic steel by a new fabrication route
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DOI：
10.1016/j.msea.2010.04.084
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发表时间：
2010-07
期刊：
影响因子：
6.4
通讯作者：
Lina Guo;C. Jia;B. Hu;Huiying Li
中科院分区：
文献类型：
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作者：
Lina Guo;C. Jia;B. Hu;Huiying Li
一种名义成分为Fe-12 Cr-2.5W-0.25Ti-0.2V-0.4Y2O3的低活化氧化物弥散强化（ODS）铁素体钢，采用EDTA-柠檬酸络合法合成Y2 O3颗粒，并将其添加到氩气雾化钢粉中，在130 MPa压力下于1160°C热等静压3 h，制得12 Cr-ODS，1150 ℃锻造，1050 ℃热处理2 h。研究了12 Cr-ODS钢的显微组织、拉伸性能和夏比冲击性能。透射电子显微镜研究表明，12 Cr-ODS钢具有特征的铁素体组织，包含很少的位错。拉伸特性表明，12 Cr-ODS钢在室温和550°C下具有上级拉伸强度和良好的延伸率。该材料表现出非常有吸引力的夏比冲击性能，上架能量为22 J，韧脆转变温度（DBTT）约为−15°C。等轴小晶粒的形成和氧化物颗粒的精细分散是拉伸强度和冲击性能之间良好折衷的主要原因。
A reduced activation oxide dispersion strengthened (ODS) ferritic steel with nominal composition of Fe–12Cr–2.5W–0.25Ti–0.2V–0.4Y2O3(designated 12Cr-ODS) was produced by using EDTA–citrate complex method to synthesize and add Y2O3particles to an argon atomized steel powder, followed by hot isostatic pressing at 1160°C for 3h under the pressure of 130MPa, forging at 1150°C, and heat treatment at 1050°C for 2h. The microstructure, tensile, and Charpy impact properties of the 12Cr-ODS steel were investigated. Transmission electron microscopy studies indicate that the 12Cr-ODS 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°C. The material exhibits very attractive Charpy impact properties with upper shelf energy of 22J and a ductile-to-brittle transition temperature (DBTT) of about −15°C. 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.