Study on microstructure, mechanical properties and machinability of efficiently additive manufactured AISI 316L stainless steel by high-power direct laser deposition

2017 ◽  
Vol 240 ◽  
pp. 12-22 ◽  
Author(s):  
Peng Guo ◽  
Bin Zou ◽  
Chuanzhen Huang ◽  
Huabing Gao
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
High Power ◽  
316L Stainless Steel ◽  
Laser Deposition ◽  
Aisi 316L ◽  
Aisi 316L Stainless Steel ◽  
Direct Laser Deposition ◽  
Direct Laser

Microstructure and Mechanical Properties of Electron Beam Deposits of AISI 316L Stainless Steel

2011 ◽  
Author(s):  
Liang Wang ◽  
Sergio D. Felicelli ◽  
Jacob Coleman ◽  
Rene Johnson ◽  
Karen M. B. Taminger ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Electron Beam ◽  
Process Parameters ◽  
316L Stainless Steel ◽  
Beam Current ◽  
Aisi 316L ◽  
Translation Speed ◽  
Aisi 316L Stainless Steel ◽  
Microstructure And Mechanical Properties

Electron beam freeform fabrication (EBF3) is a process that uses an electron beam and wire feedstock to fabricate metallic parts inside a vacuum chamber. In this study, single and multiple layer linear deposits of AISI 316L stainless steel were produced with the EBF3 machine at NASA Langley Research Center (LaRC). EBF3 process parameters, including beam current, translation speed, and wire feed rate, were investigated in order to consider their effects on the resulting steel deposit geometry, microstructure and mechanical properties. Results indicate that the EBF3 process can produce pore-free, fully dense material within the range of process parameters used in this study. The electron beam deposited stainless steel has a solidification microstructure with fine columnar grains within most parts of the deposit due to the high cooling rate during the deposition, with some small homogeneous equiaxed grains at the top of the deposit. The mechanical properties of the deposits are comparable to those of wrought metal, which is attributed to the homogeneous fine-grained microstructure.

Study of solidification behaviour and mechanical properties of arc stud welded AISI 316L stainless steel

2019 ◽  
Vol 1 (97) ◽  
pp. 5-14 ◽  
Author(s):  
M.H. Abass ◽  
M.S. Alali ◽  
W.S. Abbas ◽  
A.A. Shehab
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
316L Stainless Steel ◽  
Welding Current ◽  
Primary Phase ◽  
Aisi 316L ◽  
Aisi 316L Stainless Steel ◽  
Microstructure And Mechanical Properties ◽  
Steel Stud

Purpose: This paper aims to investigate the impact of arc stud welding (ASW) process parameters on the microstructure and mechanical properties of AISI 316L stainless steel stud/plate joint. Design/methodology/approach: The weld performed using ASW machine. The influence of welding current and time on solidification mode and microstructure of the fusion zone (FZ) was investigated using optical microscope and scanning electron microscope (SEM). Microhardness and torque strength tests were utilised to evaluate the mechanical properties of the welding joint. Findings: The results showed that different solidification modes and microstructure were developed in the FZ. At 400 and 600 A welding currents with 0.2 s welding time, FZ microstructure characterised with single phase austenite or austenite as a primary phase. While with 800 A and 0.2 s, the microstructure consisted of ferrite as a primary phase. Highest hardness and maximum torque strength were recorded with 800 A. Solidification cracking was detected in the FZ at fully austenitic microstructure region. Research limitations/implications: The main challenge in this work was how to avoid the arc blow phenomenon, which is necessary to generate above 300 A. The formation of arc blow can affect negatively on mechanical and metallurgical properties of the weld. Practical implications: ASW of austenitic stainless steel are used in multiple industrial sectors such as heat exchangers, boilers, furnace, exhaust of nuclear power plant. Thus, controlling of solidification modes plays an important role in enhancing weld properties. Originality/value: Study the influence of welding current and time of ASW process on solidification modes, microstructure and mechanical properties of AISI 316 austenitic stainless steel stud/plate joint.

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