Effect of χ Phase on the Impact Toughness of 25Cr-7Ni-4Mo Super Duplex Stainless Steel

Purpose: The purpose of the current research is to quantify the impact of notch parameters viz. width, depth and central angle (perimeter length) on the fatigue life of UNS S32760 grade of super duplex stainless steel. Design/ Methodology/ Approach: Finite element analysis approach is implemented by using the popular software package ANSYS 18.1 and the experimental runs are selected as per the requirements of Taguchi L9 orthogonal array. TOPSIS approach is used along with Taguchi method to know about the impact of notch parameters and arrive at the optimal condition. Findings: It is quantitatively established that notch depth is the most critical parameter and it affects the fatigue life to a greater extent (63.4%) when compared to other factors viz. notch width (10.6%) and central angle (7.31%).

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Effect of heat treatment on structure and properties of GTAW and laser beam welded super-duplex stainless steel joints

International Journal of Modern Physics B ◽

10.1142/s0217979220400615 ◽

2019 ◽

Vol 34 (01n03) ◽

pp. 2040061 ◽

Cited By ~ 1

Author(s):

Kai Qi ◽

Guangjin Wang ◽

Yunxue Jin ◽

Jiayang Gu ◽

Zhongyu Zhang ◽

...

Keyword(s):

Solid Solution ◽

Stainless Steel ◽

Corrosion Resistance ◽

Impact Toughness ◽

Laser Beam ◽

Duplex Stainless Steel ◽

Solution Treatment ◽

Solid Solution Treatment ◽

Pitting Corrosion Resistance ◽

The Impact

Duplex stainless steel, consisting of ferrite and austenite, has good corrosion resistance and is often used in harsh marine environments. In this paper, welding on SAF2507 duplex stainless steel with 5 mm thickness was finished by laser beam welding (LBW) and gas tungsten arc welding (GTAW). The post-weld solid solution treatment was also conducted at temperature of [Formula: see text]C followed with cooling by water after 1 h. The results showed that both LBW and GTAW could produce well-produced welds. The microstructures of the welds were composed of ferrite and austenite phases. After solid solution treatment at [Formula: see text]C, the two-phase structure of LBW joint became uniform, while [Formula: see text] phase was produced in GTAW joint. The impact test of welded joints at room-temperature was carried out. After solid solution treatment at [Formula: see text]C, the impact toughness of LBW joints obviously increased, but the impact toughness of GTAW joint decreased with the fracture morphology of brittle mode. The electrochemical experiments on the welded joints showed that the pitting corrosion resistance of LBW joints improved after solid solution treatment, while the pitting corrosion resistance of GTAW joints decreased.

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Microstructure and Impact Toughness of Weld Metal in Multipass Welded Super Duplex Stainless Steel

Journal of Ocean Engineering and Technology ◽

10.5574/ksoe.2012.26.6.027 ◽

2012 ◽

Vol 26 (6) ◽

pp. 27-32 ◽

Cited By ~ 1

Author(s):

Won-Chan Seo ◽

Chan Park ◽

Kook-Soo Bang

Keyword(s):

Stainless Steel ◽

Impact Toughness ◽

Weld Metal ◽

Duplex Stainless Steel ◽

Super Duplex Stainless Steel

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Effect of Embrittlement on the Microstructure, Mechanical and Wear Properties of Aged Super Duplex Stainless Steel

Journal of Material Science and Technology Research ◽

10.31875/2410-4701.2020.07.6 ◽

2020 ◽

Vol 7 ◽

Author(s):

Mahesh Davanageri ◽

D. Disha ◽

K. Raju

Keyword(s):

Heat Treatment ◽

Stainless Steel ◽

Duplex Stainless Steel ◽

Dry Sliding Wear ◽

Super Duplex Stainless Steel ◽

Wear Properties ◽

Solution Treated ◽

Α Phase ◽

Two Phases ◽

The Impact

In the present study, the effect of embrittlement on the microstructural features, mechanical and dry sliding wear properties of AISI 2507 super duplex stainless steel (SDSS) has been discussed. Prior to heat treatment the SDSS has been solution treated. Further, SDSS has been heat treated at 475°C for 60 min and then quenched in water and oil at room temperature. The heat treatment has led to the embrittlement in SDSS owing to the decomposition of ferrite phase by spinodal decomposition into two phases, Cr-rich (α΄) phase and Fe-rich (α) phase. Embrittlement of super duplex stainless steel resulted in significant improvement in ultimate tensile strength and hardness. However, a decrease in the impact energy has been observed. Oil quenched super duplex steel has better wear resistance compared to water quenched and solution treated steels.

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