Role of evolving microstructure on the mechanical properties of electron beam welded ferritic-martensitic steel in the as-welded and post weld heat-treated states

Manugula, Vijaya L.; Rajulapati, Koteswararao V.; Reddy, G. Madhusudhan; Rao, K. Bhanu Sankara

doi:10.1016/j.msea.2017.05.036

Cited by 67 publications

(19 citation statements)

References 26 publications

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“…To enhance the metallurgical behavior and mechanical properties of the weld joints one set from each test specimens was subjected to PWHT at a temperature of 550 ºC for 75 minutes. A literature survey was followed to estimate the time and temperature for heat treatment that could be advantageous and avoid the embrittlement phenomenon [3,32,36,39,40].…”

Section: Post Weld Heat Treatmentmentioning

confidence: 99%

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Effect of post weld heat treatment on metallurgical and mechanical properties of electron beam welded AISI 409 ferritic steel

2020

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The applicability of ferritic stainless steel is restricted due to its low weldability, and this can be attributed to the severe grain growth in the weld zone during the solidification of the weld pool and formation of fully ferritic structure. This study aims to investigate the weldability of 18 mm thick AISI 409 ferritic stainless steel plates using an electron beam welding process without the use of filler metal. The joints were investigated for metallography characterization (microstructure, macrostructure, and microhardness) and mechanical behavior (tensile strength and impact toughness) in as-welded condition and after post-weld heat treatment at 550 ºC for 75 minutes. The weld zone exhibited large columnar grains in the direction perpendicular to the weld centerline and got refined after post-weld heat treatment. The ultimate tensile strength, yield strength, and microhardness of the weld zone were found higher than the base metal. The impact toughness of weld zone was found to be reduced by 45%, but the post-weld heat treatment improved the toughness by 40%. Results revealed that the electron beam welding process could be successfully employed for welding of AISI 409 ferritic stainless steel, which will increase its application range that requires thicker section of welded plates. Post-weld heat treatment was found to be advantageous for improving the microstructure and mechanical properties.

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Section: Post Weld Heat Treatmentmentioning

confidence: 99%

“…The impact toughness was found to be critically reduced after welding, but the application of PWHT sufficiently improved the properties. Manugula et al [36] also mentioned the improvement in impact toughness after the successful implementation of PWHT when welded using the EBW process.…”

Section: Introductionmentioning

confidence: 99%

Effect of post weld heat treatment on metallurgical and mechanical properties of electron beam welded AISI 409 ferritic steel

2020

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“…Therefore, only some new low carbon martensite forms, while the non-austenitic fraction just undergoes further tempering, i.e., coarsening of carbides and softening of the matrix. In the subcritical HAZ (SCHAZ), the original microstructure only undergoes further tempering for a short time [36,49].…”

Section: Instrumented Charpy Impact Testmentioning

confidence: 99%

“…Mn + Ni content 1 wt.% for repair welding [44] [46], and 760 • C [47]. The majority of researchers who did not focus on the optimization of PWHT temperature applied 760 • C, e.g., [26,36,43,[48][49][50], in most cases for a duration of 2-3 h.…”

Section: Introductionmentioning

confidence: 99%

Optimization of PWHT of Simulated HAZ Subzones in P91 Steel with Respect to Hardness and Impact Toughness

Lojen

Vuherer

2020

Metals

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Appropriate post weld heat treatment (PWHT) is usually obligatory when creep resistant steels are welded for thermal power plant components that operate at elevated temperatures for 30-40 years. The influence of different PWHTs on the microstructure, hardness, and impact toughness of simulated heat affected zone (HAZ) subzones was studied. Thereby, coarse grained HAZ, two different fine grained HAZ areas, and intercritical HAZ were subjected to 20 different PWHTs at temperatures 740–800 °C and durations 0.5–8 h. It was found that the most commonly recommended PWHT, of 3 h or less at 760 °C, is insufficient with respect to the hardness and impact toughness of coarse grained HAZ. To obtain a Vickers hardness ≤ 265 HV and impact toughness at least equal to the impact toughness of the base metal (192 J) in the coarse grained HAZ, it took 8 h at 740 °C, 4 h at 760 °C, more than 1 h at 780 °C, and 0.5 h and 800 °C. Even after 8 h at 800 °C, mechanical properties were still within the target range. The most recommendable post weld heat treatments at 780 °C for 1.2–2 h or at 760 °C for 3–4 h were identified. All specimens subjected to these treatments exhibited appropriate hardness, impact toughness, and microstructure.

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“…There are some alternative methods for PWHT in recent years. For example, temper bead welding (TBW) has the similar effect with PWHT, which attempts to control deposition of the weld layers during weld repairs [30]; Post-weld normalizing heat treatment (PWNT) can eliminate the δ-ferrite in the weld zone and refine the grain structure, which divided PWHT into two steps, first normalizing and then tempering [31].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal

Yan

Cao

et al. 2020

Materials

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The demand for heat-resistant steel has increased owing to its utility in numerous devices that must withstand high steam pressures and high temperatures, such as turbine rotors and blades in ultra-supercritical power plants. It is inevitable to join heat-resistance steel part by welding method, so it is important to maintain the toughness of the weld metals. In this study, the microstructure, low-temperature impact toughness, and fracture surface of as-welded and post-weld heat treatment (PWHT) of 2.25Cr-1Mo-0.25V weld metal were investigated. The microstructures of the as-welded and PWHT specimens are granular bainite and ferrite, respectively. This work revealed the relationship between effective microstructure nearby crack initiation origin and low temperature impact toughness for both the as-welded and PWHT specimens. The evolution of the microstructure and prior austenite was then investigated using confocal laser scanning microscopy (CLSM) to observe the formation of coarse ferrite grain structures. A suggestion for enhancing the low-temperature toughness was provided based on the effect of adjusting Mn content and forming acicular ferrite.

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Role of evolving microstructure on the mechanical properties of electron beam welded ferritic-martensitic steel in the as-welded and post weld heat-treated states

Cited by 67 publications

References 26 publications

Effect of post weld heat treatment on metallurgical and mechanical properties of electron beam welded AISI 409 ferritic steel

Effect of post weld heat treatment on metallurgical and mechanical properties of electron beam welded AISI 409 ferritic steel

Optimization of PWHT of Simulated HAZ Subzones in P91 Steel with Respect to Hardness and Impact Toughness

Microstructure and Charpy Impact Toughness of a 2.25Cr-1Mo-0.25V Steel Weld Metal

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