对氩气雾化Fe-14Cr-3W-0.4Ti(质量分数,%)合金粉末进行60 h机械球磨,在950 ℃对粉末进行热挤压成形,然后在950 ℃热轧制和1 050 ℃/1 h退火热处理,得到Fe-14Cr-3W-0.4Ti合金。利用扫描电镜和背散射电子衍射分析仪观察和分析合金的显微组织,并测定合金的室温拉伸性能,研究热轧变形对Fe-14Cr-3W-0.4Ti合金组织与力学性能的影响。结果表明,热轧变形可有效调控Fe-14Cr-3W-0.4Ti合金的晶粒尺寸,提高合金的力学性能。经过热轧变形的合金,晶粒明显细化,并且随热轧制变形量增加,晶粒尺寸先减小后增大,合金的抗拉强度也出现先升高后降低现象。合金的最佳热轧参数为950 ℃/40%,变形量为40%的合金平均晶粒尺寸最小,为1.39 μm,抗拉强度和伸长率分别达到1 161 MPa和9.5%,与挤压成形态合金相比,抗拉强度提高31.2%。
The atomized Fe-14Cr-3W-0.4Ti (mass fraction, %) alloy powder was subjected to mechanical ball milling for 60 h, hot extrusion forming at 950 ℃, hot rolling at 950 ℃ and annealing at 1 050 ℃/1 h to obtain Fe-14Cr-3W-0.4Ti alloy. The effects of hot rolling deformation on the microstructure and mechanical properties of Fe-14Cr-3W-0.4Ti alloy were studied by Scanning Electron Microscopy (SEM) and Electron Backscattering Diffraction (EBSD) analysis. The results show that hot rolling deformation can effectively control the grain size of Fe-14Cr-3W-0.4Ti alloy and improve the mechanical properties of the alloy. After hot rolling, the grain size of the extruded alloy is obviously refined, the grain size decreases first and then increases, and the tensile strength of the alloy also increases first and then decreases with the increase of hot rolling deformation, and the optimum hot rolling parameters of the alloy are 950 ℃/40%. After hot rolling at 950 ℃/40% deformation, the average grain size of the alloy is the smallest and for 1.39 μm, and the tensile strength and elongation of the alloy reach 1 161 MPa and 9.5%, respectively. The tensile strength is increased by 31.2% compared with that of the extruded alloy.
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