Comparative Study on H20 Steel Billets: Additive Manufacturing vs. Powder Metallurgy

Nasar, S.; Baruch, Limor; Vijay, S.J.; Srinivas, Ch.; Jose, J.; Popov, V. V.

doi:10.1134/s0031918x21050100

Cited by 3 publications

(1 citation statement)

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“…The AM production methods have been reported to provide superior properties as compared to other production techniques. For example, AM specimens have higher density levels, lower frictional wear, and higher hardness than specimens created by powder metallurgy [23], and higher corrosion resistance than samples created by spark plasma sintering due to their reduced porosity level [24]. However, in the production of AM components, several existing techniques do not produce samples with the same mechanical and microstructural properties due to the use of different instrumentation.…”

Section: Introductionmentioning

confidence: 99%

Corrosion and Microstructural Investigation on Additively Manufactured 316L Stainless Steel: Experimental and Statistical Approach

et al. 2022

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The use of metal additive manufacturing (AM) has strongly increased in the industry during the last years. More specifically, selective laser melting (SLM) is one of the most used techniques due to its numerous advantages compared to conventional processing methods. The purpose of this study is to investigate the effects of process parameters on the microstructural and corrosion properties of the additively manufactured AISI 316L stainless steel. Porosity, surface roughness, hardness, and grain size were studied for specimens produced with energy densities ranging from 51.17 to 173.91 J/mm3 that resulted from different combinations of processing parameters. Using experimental results and applying the Taguchi model, 99.38 J/mm3 was determined as the optimal energy density needed to produce samples with almost no porosity. The following analysis of variance ANOVA confirmed the scanning speed as the most influential factor in reducing the porosity percentage, which had a 74.9% contribution, followed by the position along the building direction with 22.8%, and finally, the laser energy with 2.3%. The influence on corrosion resistance was obtained by performing cyclic potentiodynamic polarization tests (CPP) in a 3.5 wt % NaCl solution at room temperature for different energy densities and positions (Z axis). The corrosion properties of the AM samples were studied and compared to those obtained from the traditionally manufactured samples. The corrosion resistance of the samples worsened with the increase in the percentage of porosity. The process parameters have consequently been optimized and the database has been extended to improve the quality of the AM-produced parts in which microstructural heterogeneities were observed along the building direction.

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Section: Introductionmentioning

confidence: 99%