Microstructure-Property Relationships of Novel Ultra-High-Strength Press Hardening Steels

Multi-Scale Microstructural Tailoring and Associated Properties of Press-Hardened Steels: A Review

“…Generally, the steel grade and strength level of traditional Mn-B steel is determined by the C content, as presented in Table 1 . For example, 30MnB5 and 34MnB5 have C contents of 0.30–0.31 wt% and 0.33–0.34 wt%, respectively, and their corresponding tensile strength can reach 1880 MPa and 1980 MPa [ 20 , 39 ]. More recently, there have also been considerable research efforts devoted to developing PHS with even higher strength, such as 0.38% C content corresponding to a tensile strength of 2181 MPa [ 10 ].…”

“…Tu et al [ 79 ] reported that the co-addition of Nb and Mo can enhance both bending angles from 40.1° to 61.9° and bending energy from 44.2 J to 78.4 J. Yoo et al [ 40 ] investigated that the 0.05% Nb addition, as well as 0.05% Nb and 0.1% Mo co-addition in 32MnB5 steel, can increase the bending angle from 56.4° to 60.0° and 69.8°, respectively. Järvinen et al [ 39 ] found 0.15% Ti addition in 34MnB5 steel can improve the bending angle from 55° to 60.0°. In contrast, Pang et al [ 80 ] found that Ti may deteriorate the bending properties by forming micron-sized TiN particles when the N content is not well controlled in 22MnB5 steel.…”