Kurdi Abdulaziz, Degnah Ahmed, Tabbakh Thamer, Alnaser Husain, Basak Animesh Kumar
The Center of Excellence for Advanced Materials and Manufacturing, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh 11442, Saudi Arabia.
Advanced Materials Technology Institute, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh 11442, Saudi Arabia.
Materials (Basel). 2024 Jan 17;17(2):439. doi: 10.3390/ma17020439.
The deformation aspects associated with the micro-mechanical properties of the powder laser bed fusion (P-LBF) additively manufactured stainless steel 316L were investigated in the present work. Toward that, micro-pillars were fabricated on different planes of the stainless steel 316L specimen with respect to build direction, and an in situ compression was carried out inside the chamber of the scanning electron microscope (SEM). The results were compared against the compositionally similar stainless steel 316L, which was fabricated by a conventional method, that is, casting. The post-deformed micro-pillars on the both materials were examined by electron microscopy. The P-LBF processed steel exhibits equiaxed as well as elongated grains of different orientation with the characteristics of the melt-pool type arrangements. In contrast, the cast alloy shows typical circular-type grains in the presence of micro-twins. The yield stress and ultimate compressive stress of P-LBF fabricated steel were about 431.02 ± 15.51 - 474.44 ± 23.49 MPa and 547.78 ± 29.58 - 682.59 ± 21.59 MPa, respectively. Whereas for the cast alloy, it was about 322.38 ± 19.78 MPa and 477.11 ± 25.31 MPa, respectively. Thus, the outcome of this study signifies that the AM-processed samples possess higher mechanical properties than conventionally processed alloy of similar composition. Irrespective of the processing method, both specimens exhibit ductile-type deformation, which is typical for metallic alloys.
在本研究中，对粉末激光选区熔化（P-LBF）增材制造的316L不锈钢微观力学性能相关的变形方面进行了研究。为此，在316L不锈钢试样相对于构建方向的不同平面上制备了微柱，并在扫描电子显微镜（SEM）腔室内进行了原位压缩。将结果与通过传统方法即铸造制备的成分相似的316L不锈钢进行了比较。通过电子显微镜检查了两种材料上变形后的微柱。P-LBF处理的钢呈现出等轴晶粒以及不同取向的拉长晶粒，具有熔池型排列的特征。相比之下，铸造合金在存在微孪晶的情况下显示出典型的圆形晶粒。P-LBF制造的钢的屈服应力和极限压缩应力分别约为431.02±15.51 - 474.44±23.49 MPa和547.78±29.58 - 682.59±21.59 MPa。而对于铸造合金，分别约为322.38±19.78 MPa和477.11±25.31 MPa。因此，本研究结果表明，增材制造的样品比类似成分的传统加工合金具有更高的力学性能。无论加工方法如何，两种试样均表现出韧性变形类型，这是金属合金的典型特征。
