Process optimization for high fracture toughness of maraging steel rings formed by mandrel forging

Improvement of fracture toughness of Ti+Nb stabilized microalloyed and interstitial free steels processed through single phase regime control multiaxial forging

“…The improvement in the conditional fracture toughness was ascribed to the development of ultrafine sub structure and precipitation of ultrafine carbides. The enhanced fracture toughness has also been stated in other works [7,15,47,48] and the enhancement was ascribed to the development of the ultrafine grain size due to the SPD process. Moreover, the existence of cleavage facets can be found within the fractured surface of both MAFed and MAFed+S-AN microalloyed steel specimens (18c,d).…”

Effect of Hot Deformation on Microstructure, Hardness and Precipitation Kinetics in a C350 Maraging Steel Modified by Titanium Addition

“…Güiza observed that the deformation promoted an increase in hardness that decreases gradually during aging, what was justified by the recovery mechanism. Also, studying maraging steels, Jha et al 8 showed that hot working can be used to improve the fracture toughness by redistributing the carbonitrides formed during solidification and prevents the formation of new inclusions during solution treatments.…”

Modeling and improvement of saddling a stepped hollow workpiece with a profiled tool

“…Work [10] considered different empirical ratios of the geometric sizes of rings during the manufacture of a ring by using a conventional technology of forging from a standard ingot. These recommendations were proposed for the proper control over a shape in the process of forging rings on a man-drel.…”