On the Effect of Various Post Weld Heat Treatments on Microstructure of Aisi 4130 Steel Used in Sour Service Pipes

2021 ◽  
Author(s):  
Dmitry Vysochinskiy ◽  
Dmitri Rybakov
Keyword(s):  
Heat Treatments ◽  
Aisi 4130 ◽  
Sour Service ◽  
Weld Heat

scholarly journals On the Effect of Various Heat Treatments on Microstructure of AISI 4130 Steel Used in Sour Service Pipes

2020 ◽  
Author(s):  
Dmitry Vysochinskiy ◽  
Dmitri Rybakov
Keyword(s):  
Hydrogen Diffusion ◽  
Base Material ◽  
Heat Treatments ◽  
Heat Output ◽  
Transformation Rate ◽  
Martensite Formation ◽  
Steel Microstructure ◽  
Aisi 4130 ◽  
Steel Welds ◽  
Sour Service

Abstract Nowadays welding is the most common way to connect metal parts and structures. One of the challenges connected to welding it that heat output from the welding alters the microstructure of the metal creating the heat affected zone (HAZ) near the weld. In steel welds HAZ is often harder and more brittle than the base material due to formation of martensite. This might cause hydrogen induced cracking and speed up the fatigue of the weld. To mitigate the martensite formation in the HAZ different heat treatments, like preheat, interpass and PWHT are often applied. However, for 4130 steel, preheat and interpass temperatures are not expected to restrict martensite formation due to materials slow transformation rate. Preheat and interpass temperatures are still important for hydrogen diffusion and reduction of tension in the weld. This paper investigates the effect of different heat treatments on the microstructure of AISI 4130 steel used in sour service pipes. The welding and sample preparation were performed in accordance with ISO 15156 and ASME B31.3 standards. Two sample sets were produced: one with and one without preheating. The hardness tests of weld profiles were performed in accordance with ISO 15156-2 international standard. Comparison of hardness profiles indicated that preheat had virtually no effect on hardness of the steel in HAZ, although it affected hardness of fusion zone. Preheated samples were further heat treated in a furnace simulating PWHT effect. Three different PWHT condition were tested. The hardness profiles indicated that PWHT led to noticeable changes in steel microstructure. In order to understand those microstructure changes, the heat treatment of the steel during production process was reviewed and microscopic investigations of the weld profiles were performed.

scholarly journals Pengaruh Waktu Penahanan pada Perlakuan Panas Paska Pengelasan terhadap Ketangguhan Sambungan Las Baja

2019 ◽  
Vol 13 (2) ◽  
pp. 80
Author(s):  
Muhamad Fitri ◽  
Bambang Sukiyono ◽  
Martua Limido Simanjuntak
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Local Heating ◽  
Post Weld Heat Treatment ◽  
Impact Testing ◽  
Holding Time ◽  
Aisi 4130 ◽  
The Impact ◽  
Holding Temperature ◽  
Weld Heat

One of the welding methods that is widely used today because it is easier to operate, more practical in its use, can be used for all welding positions and more efficient is called Shield Metal Arc Welding (SMAW). In this welding, the base metal and filler metal will experience thermal cycles which lead to local heating and cooling processes resulting in residual stress and distortion in the material. This residual stress must be removed because it causes a decrease in the mechanical properties of the material. The most widely used method is the thermal method that is by Post Weld Heat Treatment (PWHT). The success of The post-weld heat treatment in removing residual stresses in PWHT is influenced by the holding time. This study aims to examine the effect of holding time on heat treatment, on the weld toughness of steel. In this study, the type of welding used was SMAW welding, the material used was steel AISI 4130, the electrodes used were LB-7018-1 standard application and AWS classification A5.1 E7018-1. The test holding temperature is 650oC. The holding time of testing uses three variables, namely: 2.5 hours, 4.5 hours, 6.5 hours. The Impact testing is done by the Charpy method. From this study, the influence of holding time variation on PWHT holding temperature on the weld strength of AISI 4130 steel was obtained.

Investigation of Strength Recovery in Welds of NUCu-140 Steel Through Multipass Welding and Isothermal Post-Weld Heat Treatments

2015 ◽  
Vol 46 (11) ◽  
pp. 5158-5170 ◽  
Author(s):  
Jason T. Bono ◽  
John N. DuPont ◽  
Divya Jain ◽  
Sung-Il Baik ◽  
David N. Seidman
Keyword(s):  
Heat Treatments ◽  
Multipass Welding ◽  
Strength Recovery ◽  
Weld Heat

Influence of Tool Rotational Speed and Post-Weld Heat Treatments on Friction Stir Welded Reduced Activation Ferritic-Martensitic Steel

2017 ◽  
Vol 48 (8) ◽  
pp. 3702-3720 ◽  
Author(s):  
Vijaya L. Manugula ◽  
Koteswararao V. Rajulapati ◽  
G. Madhusudhan Reddy ◽  
R. Mythili ◽  
K. Bhanu Sankara Rao
Keyword(s):  
Rotational Speed ◽  
Martensitic Steel ◽  
Heat Treatments ◽  
Tool Rotational Speed ◽  
Friction Stir ◽  
Weld Heat

An investigation on microstructure and mechanical properties of post-weld heat-treated friction stir welds in aluminum alloy 2024-W

2012 ◽  
Vol 227 (4) ◽  
pp. 649-662 ◽  
Author(s):  
Hakan Aydın ◽  
Ali Bayram ◽  
İsmail Durgun
Keyword(s):  
Room Temperature ◽  
Welded Joint ◽  
Solution Treatment ◽  
Heat Treatments ◽  
Maximum Hardness ◽  
Friction Stir ◽  
Base Materials ◽  
Heat Treated ◽  
Aluminum Alloy 2024 ◽  
Weld Heat

The present work describes the results obtained from microstructural and mechanical evaluation of post-weld heat treated friction stir welds of 2024 aluminum alloys in the W temper state. Post-weld heat treatments have been carried out at 510 °C for 2.5 h followed by ageing at room temperature for 6 months, at 100 °C and 190 °C for 10 h, and by cooling in static air (O-temper). The solution treatment caused abnormal coarsening of the grains in the stir zone, which resulted in a drop in microhardness. The strength of the as-welded joint was significantly incrased by post weld heat treatments. The maximum hardness and strength values were obtained in T6 (190 °C, 10 h) treated joint. However, the T6 (190 °C, 10 h) treated joint had the lowest ductility. On the other hand, the tensile properties of the post-weld heat treated joints were far lower than those of the unwelded base materials in the same temper states. In addition, the post-weld heat treatments did not significantly change the fracture locations of the friction stir welds.

Investigation into Microstructures of Maraging Steel 250 Weldments and Effect of Post-Weld Heat Treatments

2009 ◽  
Vol 19 (2) ◽  
pp. 264-273 ◽  
Author(s):  
Fawad Tariq ◽  
Rasheed Ahmed Baloch ◽  
Bilal Ahmed ◽  
Nausheen Naz
Keyword(s):  
Maraging Steel ◽  
Heat Treatments ◽  
Weld Heat
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