期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
Influence of MIG/MAG Welding Process on Mechanical and Pitting Corrosion Behaviors on the Super-Duplex Stainless Steel SAF 2507 Welded Joints 被引量:2
1
作者 Bruno Leonardy s. Lopes samuel F. Rodrigues +4 位作者 Eden s. silva gedeon s. reis Waldemir dos P. Martins Juvenilson Costa Damascena Valdemar s. Leal 《Materials Sciences and Applications》 2018年第2期228-245,共18页
The main objective of this research is to better understand the correlation between the constituent phases presented in the super-duplex steel SAF 2507 when it is under welding process by arc shielding gas MIG-MAG (Me... The main objective of this research is to better understand the correlation between the constituent phases presented in the super-duplex steel SAF 2507 when it is under welding process by arc shielding gas MIG-MAG (Metal Inert Gas-Metal Active Gas). Conventional short circuit transfer and derivative STT (Surface Tension Transfer) using the 2594 welding wire as a filler metal and the effects on welding power in hardness, toughness and pitting corrosion are considered here. The results showed that the welding energy (Ew) changed the α/γ-phase’s balance and occasionally formed σ-phase in ferrite grain boundaries which led to changes in hardness, toughness and pitting corrosion resistance in molten zone (MZ), heat activated zone (HAZ) and metal base regions (MB). Furthermore, the increased amount of γ-phase improved the pitting corrosion resistance index (PRENγ) mainly in the MZ. This is due to decrease of α-phase fraction and formation of coarser grains, for higher welding energy. The toughness in the MZ decreased with less formation of γ-phase, coalescence of ferritic grains and localized formation of σ-phase, raising the hardness in the HAZ when the welding energy was lower. 展开更多
关键词 Super-Duplex Steels Welding Toughness PITTING Corrosion MICROHARDNESS
下载PDF
Thermomechanical Behavior and Corrosion Resistance of a 316 L Austenitic Stainless Steel 被引量:1
2
作者 Rafael P. Ferreira Carmem C. F. Nascimento +2 位作者 gedeon s. reis Eden s. silva samuel F. Rodrigues 《Materials Sciences and Applications》 2020年第4期217-233,共17页
Hot-formed components are constantly exposed to hostile environments with corrosive substances. Microstructural changes caused by thermomechanical processing can be predicted to increase the corrosion resistance of au... Hot-formed components are constantly exposed to hostile environments with corrosive substances. Microstructural changes caused by thermomechanical processing can be predicted to increase the corrosion resistance of austenitic stainless steels. The objective of this study is to understand the relationship between the dynamic softening mechanisms and corrosion resistance, thus optimizing the hot-forming process. In the current work, the dynamic recrystallization (DRX) behavior of AISI 316 L austenitic stainless steel was studied in the temperature range of 1273 - 1423 K and strain-rate range of 0.1 - 5.0 s-1 using physical simulation. Subsequently, potentiodynamic polarization tests and scanning electron microscopy were performed on the hot-deformed samples to investigate the influence of temperature and strain-rate on the corrosion resistance and mechanical properties. The results indicated that the DRX fractions increased under low-temperature and high strain-rate conditions, resulting in grain refinement. The potentiodynamic polarization tests indicated that the dynamically recovered samples demonstrated high resistance to corrosion compared with the DRX samples. The best route found for the investigated alloy was for the strain to be applied at a temperature of 1423 K and a strain rate of 0.1 s-1. 展开更多
关键词 316 L AUSTENITIC STAINLESS Steel SOFTENING PHENOMENA Corrosion
下载PDF
Thermomechanical Behavior Modeling of a Cr-Ni-Mo-Mn-N Austenitic Stainless Steel 被引量:1
3
作者 Rafael P. Ferreira Eden s. silva +4 位作者 Carmem C. F. Nascimento samuel F. Rodrigues Clodualdo Aranas Jr. Valdemar s. Leal gedeon s. reis 《Materials Sciences and Applications》 2016年第12期803-822,共20页
The analytical approach and the thermomechanical behavior of a Cr-Ni-Mo-Mn-N austenitic stainless steel were characterized based on the parameters of work hardening (h), dynamic recovery (r) and dynamic recrystallizat... The analytical approach and the thermomechanical behavior of a Cr-Ni-Mo-Mn-N austenitic stainless steel were characterized based on the parameters of work hardening (h), dynamic recovery (r) and dynamic recrystallization (n, t<sub>0.5</sub>), considering constitutive equations (σ, &epsilon;) and deformation conditions expressed according to the Zener-Hollomon parameter (Z). The results indicated that the curves were affected by the deformation conditions and that the stress levels increased with Z under high work hardening rates. The σ<sub>c</sub>/σ<sub>p</sub> ratio was relatively high in the first part of the curves, indicating that softening was promoted by intense dynamic recovery (DRV). This was corroborated by the high values of r and average stacking fault energy, γ<sub>s</sub><sub>fe</sub> = 66.86 mJ/m<sup>2</sup>, which facilitated the thermally activated mechanisms, increasing the effectiveness of DRV and delaying the onset of dynamic recrystallization (DRX). The second part of the curves indicates that there was a delay in the kinetics of dynamic softening, with a higher value of t<sub>0.5</sub> and lower values of the Avrami exponent (n) due to the competing DRV-DRX mechanisms, and steady state stress (σ<sub>ss</sub>) was achieved under higher rates of deformation. 展开更多
关键词 Austenitic Stainless Steel Dynamic Recovery Dynamic Recrystallization
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部