Effect of heat input on phase content, crystalline lattice parameter, and residual strain in wire-feed electron beam additive manufactured 304 stainless steel

2018 ◽  
Vol 99 (9-12) ◽  
pp. 2353-2363 ◽  
Author(s):  
Sergei Yu. Tarasov ◽  
Andrey V. Filippov ◽  
Nikolai L. Savchenko ◽  
Sergey V. Fortuna ◽  
Valery E. Rubtsov ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Electron Beam ◽  
Residual Strain ◽  
Heat Input ◽  
Lattice Parameter ◽  
Crystalline Lattice ◽  
304 Stainless Steel ◽  
Phase Content ◽  
Wire Feed

scholarly journals Heat Input Effect on Microstructure and Mechanical Properties of Electron Beam Additive Manufactured (EBAM) Cu-7.5wt.%Al Bronze

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6948
Author(s):  
Andrey Filippov ◽  
Nikolay Shamarin ◽  
Evgeny Moskvichev ◽  
Nikolai Savchenko ◽  
Evgeny Kolubaev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Electron Beam ◽  
Heat Input ◽  
Stainless Steel Substrate ◽  
Tensile Axis ◽  
Steel Substrate ◽  
Equiaxed Grains ◽  
Wire Feed

Electron beam additive wire-feed deposition of Cu-7.5wt.%Al bronze on a stainless-steel substrate has been carried out at heat input levels 0.21, 0.255, and 0.3 kJ/mm. The microstructures formed at 0.21 kJ/mm were characterized by the presence of both zigzagged columnar and small equiaxed grains with 10% of Σ3 annealing twin grain boundaries. No equiaxed grains were found in samples obtained at 0.255 and 0.3 kJ/mm. The zigzagged columnar ones were only retained in samples obtained at 0.255 kJ/mm. The fraction of Σ3 boundaries reduced at higher heat input values to 7 and 4%, respectively. The maximum tensile strength was achieved on samples obtained with 0.21 kJ/mm as tested with a tensile axis perpendicular to the deposited wall’s height. More than 100% elongation-to-fracture was achieved when testing the samples obtained at 0.3 kJ/mm (as tested with a tensile axis coinciding with the wall’s height).

Controlling the porosity using exponential decay heat input regimes during electron beam wire-feed additive manufacturing of Al-Mg alloy

2020 ◽  
Vol 108 (9-10) ◽  
pp. 2823-2838 ◽  
Author(s):  
V. R. Utyaganova ◽  
Andrey V. Filippov ◽  
N. N. Shamarin ◽  
A. V. Vorontsov ◽  
N. L. Savchenko ◽  
...  
Keyword(s):  
Electron Beam ◽  
Additive Manufacturing ◽  
Exponential Decay ◽  
Heat Input ◽  
Mg Alloy ◽  
Feed Additive ◽  
Decay Heat ◽  
Wire Feed

Effect of Cold Rolling on Sensitization of 304 Stainless Steel Weldments

2013 ◽  
Vol 856 ◽  
pp. 60-63
Author(s):  
M. Milad ◽  
N. Zreiba
Keyword(s):  
Stainless Steel ◽  
Heat Input ◽  
Cold Work ◽  
304 Stainless Steel ◽  
Optimum Level ◽  
Microstructural Investigation ◽  
Welding Heat Input ◽  
Degree Of Sensitization ◽  
Electrochemical Potentiokinetic Reactivation ◽  
Cold Rolled

The sensitization of stainless steel type AISI304 (304SS) is evaluated as a function of pre-welding cold work and welding heat input. 304SS is cold rolled to various percentages of thickness reduction of up to 50% at ambient temperature before being TIG welded. The susceptibility of 304SS to sensitization (weld decay) is evaluated using ASTM A262, practice A and electrochemical potentiokinetic reactivation tests. The results indicate that the influence of pre-welding cold work on the degree of sensitization (DOS) is distinct and appreciable within the range of 10% to 35% CR. In addition, within this range the optimum level of cold work after which the DOS starts to decrease is found to be inversely related to the amount of welding heat input. At higher levels of cold work of ≥ 35% CR, it is found that neither the cold work nor the heat input significantly influences the amount of DOS. Microstructural investigation showed that the predominant intergranular corrosion (IGC) occurs at austenite grain boundaries and less likely at ferrite / austenite interfaces of the weld metal. Meanwhile, transgranular attack at austenite bulk matrix along the defects is rarely observed.

scholarly journals The Effect of Bulk Composition on Swelling and Radiation-Induced Segregation in Austenitic Alloys

2000 ◽  
Vol 650 ◽  
Author(s):  
T. R. Allen ◽  
J. I. Cole ◽  
N. L. Dietz ◽  
Y. Wang ◽  
G. S. Was ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Grain Boundary ◽  
Bulk Composition ◽  
High Energy ◽  
Lattice Parameter ◽  
304 Stainless Steel ◽  
Microstructural Development ◽  
Nickel Concentration ◽  
Void Swelling ◽  
Radiation Induced

ABSTRACTChanges in bulk composition are known to affect both radiation-induced segregation and microstructural development, including void swelling in austenitic stainless steel. In this work, three alloys (designations corresponding to wt%) have been studied: Fe-18Cr-8Ni alloy (bulk composition corresponding to 304 stainless steel), Fe-18Cr-40Ni (bulk composition corresponding to 330 stainless steel), and Fe-16Cr-13Ni (bulk composition corresponding to 316 stainless steel). Following irradiation with high-energy protons, the change in hardness and microstructure (void size distribution and grain boundary composition) due to irradiation was investigated. Increasing the bulk nickel concentration decreases void swelling, increases matrix hardening, and increases grain boundary chromium depletion and nickel enrichment. The analysis shows that decreases in lattice parameter and shear modulus due to radiation- induced segregation (RIS) correlate with decreased void swelling and a decreased susceptibility to irradiation assisted stress corrosion cracking (IASCC). Traditional thinking on IASCC assumed RIS was a contributing factor to cracking. It may, however, be that properly controlled RIS can be used to mitigating cracking.

scholarly journals A Study on Microstructure, Residual Stresses and Stress Corrosion Cracking of Repair Welding on 304 Stainless Steel: Part I-Effects of Heat Input

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2416
Author(s):  
Yun Luo ◽  
Wenbin Gu ◽  
Wei Peng ◽  
Qiang Jin ◽  
Qingliang Qin ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Residual Stresses ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Heat Input ◽  
Corrosion Cracking ◽  
304 Stainless Steel ◽  
Sensitivity Index ◽  
Repair Welding

In this paper, the effect of repair welding heat input on microstructure, residual stresses, and stress corrosion cracking (SCC) sensitivity were investigated by simulation and experiment. The results show that heat input influences the microstructure, residual stresses, and SCC behavior. With the increase of heat input, both the δ-ferrite in weld and the average grain width decrease slightly, while the austenite grain size in the heat affected zone (HAZ) is slightly increased. The predicted repair welding residual stresses by simulation have good agreement with that by X-ray diffraction (XRD). The transverse residual stresses in the weld and HAZ are gradually decreased as the increases of heat input. The higher heat input can enhance the tensile strength and elongation of repaired joint. When the heat input was increased by 33%, the SCC sensitivity index was decreased by more than 60%. The macroscopic cracks are easily generated in HAZ for the smaller heat input, leading to the smaller tensile strength and elongation. The larger heat input is recommended in the repair welding in 304 stainless steel.

Effects of M23C6 precipitation on the lattice parameter of AISI 304 stainless steel

1985 ◽  
Vol 3 (3) ◽  
pp. 115-118 ◽  
Author(s):  
A. Boeuf ◽  
S. Crico ◽  
R. Caciuffo ◽  
F. Rustichelli ◽  
I. Pomot ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Lattice Parameter ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304
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