Effect of heat input on microstructure and mechanical properties of dissimilar joints between super duplex stainless steel and high strength low alloy steel

Microstructure, mechanical properties and corrosion behavior of laser welded dissimilar joints between ferritic stainless steel and carbon steel

“…Because grains close to the fusion line were undergo higher peak temperature treatment than those a little far away which were recrystallized and refined, Upper Bainite and Widmanstatten ferrite formed as shown in Fig. 5(b) which is consistent with the observation reported [6,[14][15][16]. The width of coarser grain area near interface in high temperature HAZ (HTHAZ), refined grain area in lower temperature HAZ (LTHAZ) of CS and the width of HAZ in FSS are given in Table 3.…”

“…Table 3 Width of HAZ of different dissimilar joints It is notable that type II grain boundary appeared in the weld bead close to fusion line at CS side. The development of such boundary was attributed to the differences in the crystal structure between the base materials, and has been addressed in many studies for dissimilar fusion welded joints [6,13]. Moreover, the occurrence of type II boundaries is reported to be due to the transition in primary solidification behavior caused by the compositional gradient normal to the fusion boundary [17][18].…”

“…Welding dissimilar materials is generally more challenging than welding similar ones for differences in the chemical, physical and mechanical properties of the base metals [4][5][6]. Dissimilar joints between stainless steel (SS) and carbon steel (CS) are widely used in in the main steam lines of power plants, in nuclear reactors, and in petrochemical plants.…”

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

“…Moreover, high heat input and satisfactory time intended for ferrite-austenite transformation produce superior austenite content, and heat input plays the main role in the corrosion resistance and microstructure of DSS joints. This finding clearly explains that heat input is directly related to the strength and metallurgical aspects of DSS [31,95,96].…”

The impact of heat input on the strength, toughness, microhardness, microstructure and corrosion aspects of friction welded duplex stainless steel joints

“…The effect of three individual friction welding process parameters namely friction pressure, upsetting pressure and speed of rotations on the mechanical and metallurgical properties was analyzed and it was found that the impact toughness of the friction welded joints were better than the fusion welded duplex stainless steel at room and cryogenic conditions [14]. In the other study, the effect of heat input on the microstructure and mechanical properties of dissimilar joints between a Super Duplex Stainless Steel (UNS S32750) and API X-65 a HSLA was investigated by employing GTAW process and it was found that secondary phases were not present [15]. After a detailed study of literatures, it is possible to determine that most of the investigations were carried out to explore the characteristics by heat transfer/heat input on DSS through varieties of welding techniques.…”