5 天之前 · For the LPBF process, gas-atomized TWIP steel powders (purchased from Hebei Guifa Alloy Wear-resistant Materials Co., Ltd.) with a size distribution ranging from 15 μm to 53 μm were utilized. ... After various heat treatments, all samples consist solely of the austenite phase, as confirmed by the XRD data shown in Fig. 5. This suggests that ...

1 天前 · XRD analysis showing phase identification of the LPBF-printed NAB alloy with and without heat treatment: (a) XRD patterns of heat-treated samples at various temperatures, with labelling of the peaks corresponding to the crystallographic planes of the α-Cu phase; (b) enlarged view between 72° and 75°; (c) lattice microstrain changes of the α ...

2024年11月1日 · In this study, 316L stainless steel Laser Powder Bed Fusion (LPBF) samples were manufactured under three different building orientations (0°, 45°, and 90°). Mechanical, microstructural, tribological and corrosion resistance properties were analyzed for all samples.

5 天之前 · The earliest research on LPBF TWIP steels was reported by Niendorf and Brenne [11], which demonstrated fully austenitic structures with <001> textures along the build direction and the presence of a TWIP effect after deformation. ... (SEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), electron backscatter diffraction (EBSD ...

西安交通大学高瑞博士与苏州大学、吉林大学团队采用 LPBF 制备添加5 wt% WC 的CrMnFeCoNi HEAs，在室温下表现出高屈服强度、极限抗拉强度和优异延展性的优异组合。 文章链接： doi.org/10.1016/j.jmrt. 通过氩气雾化制备了粒径范围为10-53μm的等原子CrMnFeCoNi合金粉末。 将平均粒径约为400nm的纳米级WC颗粒（2 wt%、5 wt%和8 wt%）与原始CrMnFeCoNi合金粉末混合，通过球磨机装置获得复合粉末。 LPBF激光功率、扫描速度、扫描间距和层厚度分别 …

2024年11月11日 · The phase structure of the LPBF and heat-treated samples was investigated by X-ray diffraction (XRD, 7000SX, Shimadzu) using Cu-Kα radiation under the following conditions: step-scan mode with...

2025年4月1日 · Combined with the characteristics of LPBF rapid cooling, the rapid cooling rates of selective laser melting, estimated at 10 6 K/s (Ref 21), more austenite will be present in sample 1-4 at room temperature. The results of XRD for sample 1-4 and sample 2-11 are shown in Fig. 5(b). Through comparison with standard PDF cards and employing the ...

摘要 以激光粉末床熔融(L-PBF)增材制造的316L 不锈钢作为研究对象,重点研究了0° 和60°两个不同成型方向对打印件显微组织和力学性能的影响,并利用原位电子背散射衍射(EBSD)技术研究了L-PBF 316L不锈钢在拉伸变形过程中组织和晶粒取向的演变过程。 研究结果表明:L-PBF 增材制造316L 不锈钢的显微组织存在孔洞缺陷,在60° 成型方向上还存在着鱼鳞状微熔池。 成型方向为60° 时制件的抗拉强度更高,为 (645.61±15.50)MPa,0°成型方向上制件的伸长率更好,为 …

3 天之前 · The effects of laser powder bed fusion (LPBF) parameters, such as power (200 to 350 W) and scan speeds (from 200 to 2000 mm/s), on the microstructure and mechanical properties of high-strength, low-alloy (HSLA) AISI 4340 steel were examined. A wide range of volumetric energy density (VED) between 93 and 162 J/mm3 produced samples with relative densities greater than 99.8%. The optimal ...

2024年5月11日 · 在当前的工作中，南方科技大学逯文君教授团队开发了一种新策略，通过LPBF的原位合金化，在等原子 CoCrNi/Cr2B 复合材料中获得了良好的强度-延展性组合。