Short answer

When designing components from 316L stainless steel for environments prone to stress corrosion cracking, consider sinter-based additive manufacturing for improved resistance to crack propagation, even if crack initiation resistance is slightly lower than some wrought alternatives.

Field: Final Production
Source: Preprints.org (2023)
Method: Experimental testing and microanalysis
Evidence: Moderate effect

Components additively manufactured using sinter-based material extrusion demonstrate superior resistance to crack-branching in stress corrosion cracking environments compared to traditional wrought 316L stainless steel. This final production research insight is drawn from a 2023 study published in Preprints.org. Using Experimental testing and microanalysis, researchers explored how this design variable affects real-world outcomes. The key design takeaway: When designing components from 316L stainless steel for environments prone to stress corrosion cracking, consider sinter-based additive manufacturing for improved resistance to crack propagation, even if crack initiation resistance is slightly lower than some wrought alternatives.

Study

Final ProductionRecentModerate effect

Sinter-based AM 316L Stainless Steel Exhibits Enhanced Stress Corrosion Cracking Resistance to Crack-Branching

Preprints.org · 2023

Key Findings

01Sinter-based AM 316L SS is more susceptible to SCC initiation than SA wrought 316L SS.
02Sinter-based AM 316L SS is more resistant to SCC initiation than CD wrought 316L SS.
03Sinter-based AM 316L SS exhibits noticeably better resistance to crack-branching than both SA and CD wrought 316L SS counterparts.

Application

Design takeaway

How to apply

When specifying materials for marine, chemical processing, or medical implant applications where stress corrosion cracking is a risk, evaluate the crack-branching resistance of sinter-based AM 316L alongside traditional wrought options.

Project actions

01When investigating material performance, consider multiple failure mechanisms, not just the initial point of failure.
02Use advanced microscopy techniques to understand the microstructural reasons behind observed material behaviors.

Method & Evidence

AimTo investigate the stress corrosion cracking (SCC) behavior of 316L stainless steel produced via sinter-based material extrusion additive manufacturing (AM) and compare its susceptibility to crack initiation and branching against solution-annealed and cold-drawn wrought 316L stainless steel.

MethodExperimental testing and microanalysis

ProcedureCustom-made C-ring specimens of sinter-based AM 316L SS, solution-annealed (SA) wrought 316L SS, and cold-drawn (CD) wrought 316L SS were subjected to various stress levels in acidic chloride solutions at different temperatures. Pre- and post-test microstructural analysis was conducted using light optical microscopy (LOM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and micro-computed tomography (micro-CT).

ContextMaterials science, additive manufacturing, corrosion engineering

Variables

IV["Manufacturing method (sinter-based AM vs. wrought SA vs. wrought CD)","Applied stress level","Corrosive solution composition","Temperature"]

DV["Stress corrosion cracking initiation time","Crack propagation rate","Presence and extent of crack-branching"]

CV["Specimen geometry (C-ring)","Specific acidic chloride solution formulation","Exposure duration (for comparison purposes)"]

Strengths & Limitations

Strengths

+Direct comparison with established wrought materials provides a valuable benchmark.
+Utilizes advanced microanalysis techniques to elucidate the underlying mechanisms.

Limitations

The specific corrosive environment used in the study might not represent all real-world scenarios. The cost and scalability of sinter-based AM for this specific application were not assessed.

Reliability & validity

The use of multiple analytical techniques (LOM, SEM, EBSD, micro-CT) enhances the validity of the microstructural findings. The comparison with established wrought materials provides a strong basis for assessing the relative performance of the AM material. Reliability would depend on the number of replicate tests performed for each condition.

Think critically

How might the specific pore structure or grain orientation inherent to sinter-based AM influence the crack propagation path, leading to reduced branching compared to the more homogeneous microstructure of wrought steel?

Design Principles

"Material selection for corrosive environments should consider not only the initiation of failure but also the propagation characteristics of potential failure modes."

This finding is crucial for designers and engineers selecting materials for applications exposed to corrosive environments and mechanical stress. Understanding the nuanced performance of additively manufactured materials allows for more informed material choices, potentially leading to more durable and reliable products.

What This Means for Your Design

Steel made using a 3D printing method (sinter-based material extrusion) is better at stopping cracks from spreading than regular steel, even though it might be a little easier for a crack to start in the first place.

How to use in your project

1.Reference this study when discussing the material properties of additively manufactured metals, particularly concerning their performance in corrosive environments.
2.Use the findings to justify material choices in a design project where durability and resistance to cracking are key requirements.

Add to My Project

Quick Cite

Paragraph starter

Research indicates that sinter-based material extrusion additive manufacturing of 316L stainless steel can offer enhanced resistance to stress corrosion cracking crack-branching compared to traditional wrought forms (Santamaria et al., 2023). While initiation susceptibility may be comparable or slightly higher, the reduced tendency for cracks to branch suggests potential for improved component longevity in aggressive environments.

Source

Preprints.org

Stress Corrosion Cracking of 316L Stainless Steel Additively Manufactured with Sinter-based Material Extrusion

journal · 2023

View source

Questions About This Research

What does the research say about sinter-based am 316l stainless steel exhibits enhanced stress corrosion cracking resistance to crack-branching?: When designing components from 316L stainless steel for environments prone to stress corrosion cracking, consider sinter-based additive manufacturing for improved resistance to crack propagation, even if crack initiation resistance is slightly lower than some wrought alternatives. Evidence: Preprints.org (2023).
Why does "Sinter-based AM 316L Stainless Steel Exhibits Enhanced Stress Corrosion Cracking Resistance to Crack-Branching" matter for design?: This finding is crucial for designers and engineers selecting materials for applications exposed to corrosive environments and mechanical stress. Understanding the nuanced performance of additively manufactured materials allows for more informed material choices, potentially leading to more durable and reliable products.
How can designers apply this research?: When designing components from 316L stainless steel for environments prone to stress corrosion cracking, consider sinter-based additive manufacturing for improved resistance to crack propagation, even if crack initiation resistance is slightly lower than some wrought alternatives.
What were the main findings?: Sinter-based AM 316L SS is more susceptible to SCC initiation than SA wrought 316L SS.. Sinter-based AM 316L SS is more resistant to SCC initiation than CD wrought 316L SS.. Sinter-based AM 316L SS exhibits noticeably better resistance to crack-branching than both SA and CD wrought 316L SS counterparts.
What research method was used?: Experimental testing and microanalysis.
How strong is the evidence?: Evidence strength is rated Moderate effect, based on a 2023 journal from Preprints.org.
What should I do differently in my next project?: When specifying materials for marine, chemical processing, or medical implant applications where stress corrosion cracking is a risk, evaluate the crack-branching resistance of sinter-based AM 316L alongside traditional wrought options.
What are the limitations?: The study focused on specific acidic chloride solutions and temperatures; performance may vary in different corrosive media or under different environmental conditions. The microstructural differences between AM and wrought materials are complex and may influence other material properties not investigated here.