|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||High Performance Steels
||Microstructural Evolution and Mechanical Properties of Zinc Coated Press Hardened Steels with Increased Carbon Content
||Sara Kheiri, Joseph McDermid, Mike Bruhis
|On-Site Speaker (Planned)
Press-hardened steels (PHS) are comprising increasing proportions of automotive body-in-white (BIW) for passenger safety applications while allowing for significant BIW mass reductions, which in turn reduce vehicle emissions. Zn coatings can be a promising alternative to the traditional Al-Si coatings for 22MnB5 family of alloys as they can provide better corrosion protection at a lower cost despite the challenge of Liquid Metal Embrittlement (LME). It has been shown that LME can successfully be avoided by using prototype 2% Mn PHS grade while meeting the target UTS of 1500 MPa. The objective of this study was to propose a substrate with higher carbon content that both avoids LME and exhibits superior mechanical properties. Thus, the C content of a PHS grade with the composition of 0.20C-2.01Mn-0.26Si-0.005Ti-0.01B (wt%) was increased by carburizing. This paper will present the microstructural development and mechanical properties as a function of processing window and substrate C content.
||Mechanical Properties, Surface Modification and Coatings, Other