scholarly journals Hardening of Additive Manufactured 316L Stainless Steel by Using Bimodal Powder Containing Nanoscale Fraction

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 115
Author(s):  
Aleksandr M. Filimonov ◽  
Oleg A. Rogozin ◽  
Denis G. Firsov ◽  
Yulia O. Kuzminova ◽  
Semen N. Sergeev ◽  
...  
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Steel Powder ◽  
Total Surface Area ◽  
Protective Atmosphere ◽  
Subgrain Structure ◽  
Protective Atmospheres ◽  
Powder Flowability ◽  
Materials Used ◽  
Porosity Analysis

The particle size distribution significantly affects the material properties of the additively manufactured parts. In this work, the influence of bimodal powder containing nano- and micro-scale particles on microstructure and materials properties is studied. Moreover, to study the effect of the protective atmosphere, the test samples were additively manufactured from 316L stainless steel powder in argon and nitrogen. The samples fabricated from the bimodal powder demonstrate a finer subgrain structure, regardless of protective atmospheres and an increase in the Vickers microhardness, which is in accordance with the Hall-Petch relation. The porosity analysis revealed the deterioration in the quality of as-built parts due to the poor powder flowability. The surface roughness of fabricated samples was the same regardless of the powder feedstock materials used and protective atmospheres. The results suggest that the improvement of mechanical properties is achieved by adding a nano-dispersed fraction, which dramatically increases the total surface area, thereby contributing to the nitrogen absorption by the material.

Effects of Powder Characteristics on Selective Laser Melting of 316L Stainless Steel Powder

2011 ◽  
Vol 189-193 ◽  
pp. 3664-3667 ◽  
Author(s):  
Sheng Zhang ◽  
Qing Song Wei ◽  
Guang Ke Lin ◽  
Xiao Zhao ◽  
Yu Sheng Shi
Keyword(s):  
Stainless Steel ◽  
Selective Laser Melting ◽  
316L Stainless Steel ◽  
Fine Powder ◽  
Steel Powder ◽  
Laser Melting ◽  
Broad Size Distribution ◽  
Lower Oxygen ◽  
Powder Characteristics ◽  
Loose Powder

316L stainless steel parts were manufactured via selective laser melting . This work stu- dies the effects of powder characteristics such as particle size and particle shape composition on the density. It shows that the powder with a broad size distribution and using spherical fine powder can lead to an increase in the density of the loose powder and thus the densification of the laser melted powder. The aerosol powder forms parts of lower oxygen content well, and the density can reach to 90%.

Warm Compacting Behaviors and Sintering Performance of 316L Stainless Steel Powder

2012 ◽  
Vol 538-541 ◽  
pp. 1088-1091
Author(s):  
Mei Yuan Ke
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
316L Stainless Steel ◽  
Sintered Density ◽  
Steel Powder ◽  
Nitrogen Atmosphere ◽  
Green Density ◽  
Cold Compaction ◽  
Warm Compaction ◽  
Made In

Warm compacting behavior and sintering performance of 316L stainless steel powders were studied. Results showed that green density and strength of samples made in warm compaction were much higher than that in cold compaction. Under pressure of 700MPa, green density and strength in warm compaction were 7.01 g•cm-3and 30.7MPa, which were higher than cold compaction by 0.19 g•cm-3and 10.7MPa. When sintered in hydrogen-nitrogen atmosphere for 60 minutes, sintered density, tensile strength and elongation all increased with the rise of sintering temperature. At 1300°C, Sintered density, tensile strength and elongation were 7.42 g•cm-3, 545MPa, 28.0%, respectively.

scholarly journals Effects of Admixed Titanium on Densification of 316L Stainless Steel Powder during Sintering

2014 ◽  
Vol 13 ◽  
pp. 04026 ◽  
Author(s):  
Muhammad Aslam ◽  
Faiz Ahmad ◽  
P.S.M BintiMegat Yusoff ◽  
Norhamidi Muhamad ◽  
M.Rafi Raza ◽  
...  
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Steel Powder ◽  
Stainless Steel Powder

scholarly journals Effect of Si Content on Sintering Behavior of Zr Pre-alloyed 316L Stainless Steel Powder

2011 ◽  
Vol 58 (1) ◽  
pp. 27-32
Author(s):  
Hidefumi Nakamura ◽  
Hisataka Toyoshima ◽  
Hidenori Otsu ◽  
Akihiko Chiba ◽  
Koetsu Abe
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Steel Powder ◽  
Stainless Steel Powder ◽  
Sintering Behavior ◽  
Si Content

scholarly journals Microstructure and Fatigue Damage of 316L Stainless Steel Manufactured by Selective Laser Melting (SLM)

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7544
Author(s):  
Zhentao Wang ◽  
Shanglei Yang ◽  
Yubao Huang ◽  
Cong Fan ◽  
Zeng Peng ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Crack Propagation ◽  
Selective Laser Melting ◽  
316L Stainless Steel ◽  
Fatigue Cracks ◽  
Steel Powder ◽  
Maximum Load ◽  
Optical Microscope ◽  
Laser Melting ◽  
Microcrack Initiation

In this paper, 316L stainless steel powder was processed and formed by selective laser melting (SLM). The microstructure of the sample was studied using an optical microscope, and the fatigue failure of the sample and the characteristics of crack initiation and propagation were analyzed, providing a research basis for the application of SLM-316L. Due to the influence of microstructure and SLM process defects, the fatigue cracks of SLM-316L mainly emerged due to defects such as lack of fusion and pores, while the cracks of rolled 316L initiated at the inclusions near the surface of the specimen. After fatigue microcrack initiation of the SLM-316L specimen, due to the existence of shear stress and tear stress, the crack tip was passivated and Z-shaped propagation was formed. The existence of internal defects in SLM-316L made the microcrack initiation random and diverse. At the same time, the existence of defects affected the crack propagation in the form of bending, bifurcation and bridge, which made the main crack propagation deviate from the maximum load direction.

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