The effect of tempering conditions on carbides in P110 casing steels

Abstract

The effect of tempering conditions on the carbides in P110 casing steels with two different Cr compositions was studied. Local Mo and Cr concentrations varied from the nominal compositions by ≈± 0.05 wt-% Mo and ≈± 0.07 wt-% Cr. The size of the fine (<20 nm) MC carbides remained relatively unaffected by tempering. Fe-based carbides exhibited a large increase in mean log-normal size from 65 to 102 nm when tempered at 650 and 715°C for 45 min, respectively. This rapid carbide coarsening is attributed to the dissolution of M23C6 carbides at 715°C. Associated with this significant increase in carbide size was an increase in the rate of hardness reduction with increasing Hollmon-Jaffe parameter for temperatures above 650°C.

Supersolidus liquid phase sintering of water-atomized low-alloy steel in binder jetting additive manufacturing

“…To ensure a successful transition to scale-up production and end-use applications, it is essential to develop a low-cost high-performance material system for BJAM. Low-alloy steels are a viable option due to their good strength, ductility, hardness, and wear resistance [ 4 ], while also being cost-effective when produced via conventional powder metallurgy (PM) processes. WA powders, which are much less expensive than GA powders, are generally used as feedstock for PM [ 1 , 5 ], but are more irregular in shape with remnant oxides [ [6] , [7] , [8] ].…”