Microstructure and mechanical properties of the TIG welded joints of fusion CLAM steel

Influence of Alloy Content and Prior Microstructure on Evolution of Secondary Phases in Weldments of 9Cr-Reduced Activation Ferritic-Martensitic Steel

“…It is known in literature [20,42] that Fe-rich M 23 C 6 , e carbides and Cr-rich Cr 2 C hexagonal carbides form during the early stages of tempering (or low temperature exposure) of martensitic steels. They subsequently get transformed to Cr-rich M 23 C 6 with progress in tempering.…”

“…[16][17][18][19] For fabrication of TBM components, fusion welding techniques like electron beam welding, tungsten inert gas (TIG) welding, and laser beam welding are chosen where the extent of heat-affected zone (HAZ) is minimum compared to other conventional methods. [20] However, in fusion welding, the weldment would possess a highly heterogeneous microstructure depending on the distance of a region from the heat source and number of passes employed. [21,22] Since it is the microstructure that decides the response of a weldment to stresses subsequent to post-weld heat treatment or during long-term service exposures [23,24] many experimental studies focused on the change in structure and property of weld and HAZ upon varying the heat input and cooling rates during welding.…”

An overview of the welding technologies of CLAM steels for fusion application

“…The research by Jiang et al [40] has studied the mechanical properties of CLAM steel joint of TIG welding with PWHT at 740 • C for 1 h, and the results are shown in Figs. 6 and 7.…”

“…Effect of PWHT on CLAM steel weld toughness. Charpy absorbed energy of specimens notched at the weld metal, HAZ and base metal and tested at room temperature [40]. process, the liquid flow in weld pool and its pool shaping processes, the solidification process and resulting phase transformations of the welded joint, the development of stress and strain during welding, mechanical behavior of the non-uniform welded joint, the formation process of the microstructure, hydrogen diffusion at HAZ, and the fracture toughness and the crack propagation of the welded structure.…”

“…(a) Macrograph of the welded joint, (b) hardness distribution measured along the top line and, (c) hardness distribution measured along central line[40].…”