Mechanical properties and corrosion behavior of selective laser melted 316L stainless steel after different heat treatment processes

Kong, Decheng; Ni, Xiaoqing; Zhang, Liang; Yao, Jizheng; Cheng, Ming; Cheng, Xuequn; Xiao, Kui; Li, Yong

doi:10.1016/j.jmst.2019.03.003

Cited by 327 publications

(97 citation statements)

References 51 publications

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“…The effects of the printing parameters on the microstructure and defect evolution during rapid solidification are widely reported, and the optimised printing parameters can usually lead to better mechanical properties. [55][56][57] However, the corrosion behaviour and durability of the selective laser melted (SLMed) parts have not drawn considerable attention to date yet [58][59][60][61][62] and the understanding of the underlying corrosion mechanisms of the SLMed metals and alloys still remains in its infancy. It is well acknowledged that corrosion leads to an annual financial loss of US$4 trillion globally due to corrosion damage and corrosion protection investment.…”

Section: Introductionmentioning

confidence: 99%

Corrosion of metallic materials fabricated by selective laser melting

Kong

2019

npj Mater Degrad

Self Cite

186

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Additive manufacturing is an emerging technology that challenges traditional manufacturing methods. However, the corrosion behaviour of additively manufactured parts must be considered if additive techniques are to find widespread application. In this paper, we review relationships between the unique microstructures and the corresponding corrosion behaviour of several metallic alloys fabricated by selective laser melting, one of the most popular powder-bed additive technologies for metals and alloys. Common issues related to corrosion in selective laser melted parts, such as pores, molten pool boundaries, surface roughness and anisotropy, are discussed. Widely printed alloys, including Ti-based, Al-based and Fe-based alloys, are selected to illustrate these relationships, and the corrosion properties of alloys produced by selective laser melting are summarised and compared to their conventionally processed counterparts.

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Section: Introductionmentioning

confidence: 99%

Corrosion of metallic materials fabricated by selective laser melting

Kong

2019

npj Mater Degrad

Self Cite

186

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“…Schaller et al and Melia et al empirically showed corrosion to preferentially occur at lack of fusion pores for powder-based AM austenitic stainless steels, leading to a reduction in breakdown potential (E b ) compared to areas excluding this porosity 7,20 . Several other examples of microstructural features and processing defects that have been investigated are; nanoscale oxides/inclusions 7,20,23,24 , solute segregation (i.e. cell boundaries, melt pool boundaries) 7,13,[22][23][24][25][26][27][28][29] , texture and grain character 29 , residual stresses 3,30,31 , surface roughness 18,20,[32][33][34][35] , and porosity 7,9,[18][19][20][21][22] .…”

Section: Introductionmentioning

confidence: 99%

How build angle and post-processing impact roughness and corrosion of additively manufactured 316L stainless steel

et al. 2020

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Additively manufactured austenitic stainless steels exhibit numerous microstructural and morphological differences compared to their wrought counterparts that will influence the metals corrosion resistance. The characteristic as-printed surface roughness of powder bed fusion (PBF) stainless steel parts is one of these morphological differences that increases the parts susceptibility to localized corrosion. This study experimentally determines the average surface roughness and breakdown potential (E b) for PBF 316L in 6 surface finished states: as-printed, ground with SiC paper, tumble polished in abrasive media, electro-polished, chemically passivated, and the application of a contour/re-melt scan strategy. In general, a smaller average surface roughness led to a larger E b. The smoothest surface treatments, ground and electro-polished conditions, led to E b near the materials limit (~+1.0 V Ag/AgCl) while all other surface treatments exhibited significantly lower E b (~+0.3 V Ag/AgCl) The build angle was also shown to impact surface roughness, where surfaces at high angles from the build direction resulted in larger roughness values, hence lower E b .

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“…Wysocki et al (2017) reported significant differences between the planes parallel and perpendicular to the building direction of the SLM printed CP-Ti in the mechanical properties and microstructure. Kong et al (2019) reported that the grain size of the SLM printed 316L stainless steel in the planes parallel to the building direction is smaller than that in the perpendicular planes, and many low-angle boundaries formed in the perpendicular planes, which results in the lower elongation in perpendicular planes compared to that of the parallel planes. As for the corrosion behavior, Zhang et al (2019) found that the planes perpendicular to the building direction of the TiC/Inconel 718 composite fabricated by SLM have superior corrosion resistance in 3.5 wt.% NaCl solution.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of an Equiatomic CoCrFeMnNi High-Entropy Alloy- a Comparison Between Selective Laser Melting and Cast

Peng

Lin

et al. 2020

Front. Mater.

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The corrosion behaviors of equiatomic CoCrFeMnNi high-entropy alloys (HEAs) were comparatively investigated between selective laser melting (SLM) and casting. The cast sample shows better corrosion resistance in 3.5 wt.% NaCl solution than the SLM printed sample due to the higher density of dislocations, pores, and cracks in SLM samples, which significantly reduces their corrosion resistance. Furthermore, it is found that the corrosion resistance is different between the planes parallel and perpendicular to the building direction of SLM sample because of the differences in grain orientation, grain size, and surface morphology. Electrochemical anode dissolution rates of the SLM printed CoCrFeMnNi HEAs on their planes parallel and perpendicular to the building direction are calculated and the results show that the pores and cracks dominate the corrosion resistance rather than the grain boundary and the grain orientation.

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Mechanical properties and corrosion behavior of selective laser melted 316L stainless steel after different heat treatment processes

Cited by 327 publications

References 51 publications

Corrosion of metallic materials fabricated by selective laser melting

Corrosion of metallic materials fabricated by selective laser melting

How build angle and post-processing impact roughness and corrosion of additively manufactured 316L stainless steel

Corrosion Behavior of an Equiatomic CoCrFeMnNi High-Entropy Alloy- a Comparison Between Selective Laser Melting and Cast

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