Impact Fracture Surfaces as the Indicators of Structural Steel Post-Fire Susceptibility to Brittle Cracking

Maślak, Mariusz; Pazdanowski, Michał; Stankiewicz, Marek; Wassilkowska, Anna; Zajdel, Paulina; Zielina, Michał

doi:10.3390/ma16083281

Cited by 6 publications

(6 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This lateral expansion serves as an indicator of the material's tendency toward ductile or brittle fracture behavior. Importantly, a greater lateral expansion correlates with a higher energy requirement for material fracture, indicating increased impact strength [15]. Conversely, reduced lateral expansion implies a decrease in material ductility.…”

Section: Discussion Of the Effect Of Welding Room Environment To The ...mentioning

confidence: 98%

Welding room development for simultaneous improvement of welder health and weld quality of gas metals arc welded aluminum AA5083-H112

Triyono,

Harseno,

Muhayat

2024

EEJET

View full text Add to dashboard Cite

This study investigated the weld joint mechanical properties and welding fume exposure associated with Gas Metal Arc Welding of aluminum AA5083-H112 in 27 different welding room environment conditions. These conditions consist of variation in temperature, as well as intake and exhaust wind velocities. The temperature varies as 19 °C, 27 °C and 35 °C. Both the intake and exhaust velocity vary as 0 m/s, 3.1 m/s and 5.5 m/s. The experimental findings underscore the pronounced influence of these factors on both weld quality and welder exposure to fumes. Notably, intake wind velocity emerges as the most critical factor, contributing significantly to 47.68 % in weld joint tensile strength. The temperature emerges as the least critical factor with 12.02 % of contribution. However, temperature became the most critical factor on weld joint impact energy with 54.89 % of contribution while exhaust wind velocity became the least with 3.89 %. Air quality monitoring highlights the importance of optimal intake and exhaust fan configuration to effectively reduce fume exposure. All examined welding room environment condition are deemed safe for the welder, as they do not exceed the Treshold Limit Value (TLV), except the condition where the welding room lacks of air circulation in intake and exhaust wind velocity of 0 m/s. The identified optimal welding room condition exerts a temperature of 27 °C, intake and exhaust wind velocity of 0 m/s and 3.1 m/s respectively. This condition not only achieves established weld quality standards but also ensures compliance with fume exposure regulation. This research provides valuable insights for optimizing welding room environment to simultaneously maintain weld quality and safeguard the well-being of welders

show abstract

Section: Discussion Of the Effect Of Welding Room Environment To The ...mentioning

confidence: 98%

Welding room development for simultaneous improvement of welder health and weld quality of gas metals arc welded aluminum AA5083-H112

Triyono,

Harseno,

Muhayat

2024

EEJET

View full text Add to dashboard Cite

show abstract

“…These tests conformed to European [15,16] and US [17,18] standards. The results of these tests have been published in part and were first presented in [19,20], relating to the credibility of the testing method itself and the conclusions drawn after the application of the selected testing methodology, and later on in [21,22], taking into account various aspects of the final rating.…”

Section: The Purpose and Scope Of Conducted Researchmentioning

confidence: 99%

Quantification of the Post-Fire Strength Retention Factors for Selected Standard Duplex and Lean Duplex Stainless Steel Grades

Maslak,

Pancikiewicz,

Pazdanowski

et al. 2024

Materials

Self Cite

View full text Add to dashboard Cite

The experimental quantification of retention factors related to the post-fire strength as well as the post-fire ductility of intentionally selected stainless steel grades applied in construction is the objective of the research presented here. These steel grades are characterized by a two-phase austenitic–ferritic microstructure of the duplex type. In this context, two mutually corresponding chromium–nickel–molybdenum steel grades are subjected to analysis, namely X2CrNiMoN22-5-3 steel belonging to the standard duplex group (DSS 22% Cr) and X2CrMnNiN21-5-1 steel belonging to the lean duplex group (LDSS). The similarities and differences in the mechanical properties exhibited by these steel grades after effective cooling, following more or less prolonged simulated fire action conforming to several development scenarios, are identified and indicated. The resistance of a given steel grade to permanent structural changes induced by the heating program proved to be the critical factor determining these properties and resulting in many cases in increased susceptibility to brittle fracture. The results obtained experimentally seem to confirm the quantitative estimates of post-fire retention factors forecast by Molkens and his team, specified for the steels exhibiting a duplex-type structure and tested by us. However, several of these estimates might be considered somewhat risky. Nevertheless, our results do not confirm the significant post-fire strengthening of steel grades belonging to the LDSS group following prior heating at a sufficiently high temperature, as reported earlier by Huang Yuner and B. Young.

show abstract

“…This phase of the process is correlated with an abrupt reduction of the applied force accompanied by minimal increase in the displacement of force application point. After this moment, the effective fracture arrest begins and the sample undergoes plastic fracture [24]. In Figure 3 Figure 3 shows instrumented Charpy impact test results by PWHT temperature after Charpy impact testing at −196 °C.…”

Section: Cryogenic Mechanical Propertiesmentioning

confidence: 99%

The Effects of Post-Welding Heat Treatment on the Cryogenic Absorbed Energy of High Manganese Steel Weld Metal

Baek

Park

Lee

et al. 2023

Metals

View full text Add to dashboard Cite

In this study, a post-weld heat treatment (PWHT) was proposed at high temperatures of 600 °C, 750 °C, and 900 °C for 30 min to significantly improve the impact absorbed energy of high manganese steel weld metal. Electron backscatter diffraction (EBSD), electron probe microanalysis (EPMA), and high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) were employed to characterize the production and study the deformation mechanisms in the high manganese steel weld metal. The impact absorbed energy is divided into crack initiation energy and crack propagation energy, which are divided by the value of Pmax. The cryogenic impact absorbed energy was 81 J. After PWHT at 600 °C, 750 °C, and 900 °C, it was 75 J, 69 J, and 88 J, respectively. The impact absorbed energies did not follow a proportional relationship with the PWHT temperatures. The increase in impact absorbed energy can be attributed to the narrowing of the dendritic region, which blocks the crack propagation path and efficiently prevents crack propagation. Conversely, the decrease in impact absorbed energy can be attributed to the presence of 100-nm-sized (Cr, Mn)23C6-type carbides at the grain boundaries, which facilitate crack propagation.

show abstract

Impact Fracture Surfaces as the Indicators of Structural Steel Post-Fire Susceptibility to Brittle Cracking

Cited by 6 publications

References 52 publications

Welding room development for simultaneous improvement of welder health and weld quality of gas metals arc welded aluminum AA5083-H112

Welding room development for simultaneous improvement of welder health and weld quality of gas metals arc welded aluminum AA5083-H112

Quantification of the Post-Fire Strength Retention Factors for Selected Standard Duplex and Lean Duplex Stainless Steel Grades

The Effects of Post-Welding Heat Treatment on the Cryogenic Absorbed Energy of High Manganese Steel Weld Metal

Contact Info

Product

Resources

About