Air-Hardening Die-Forged Con-Rods—Achievable Mechanical Properties of Bainitic and Martensitic Concepts

Metals

Udo Zitz¹  Robert Lange²  Alexander Gramlich³  Klaus Büßenschütt³ 

[1] Frauenthal Powertrain Management GmbH & Co. KG, In den Hofwiesen 13, 58840 Plettenberg, Germany;Lech-Stahlwerke GmbH, Industriestraße 1, 86405 Meitingen, Germany;Steel Institute (IEHK) of RWTH Aachen University, Intzestraße 1, 52072 Aachen, Germany;

关键词: high-strength steels;    forging;    air-cooling;    mechanical properties;    microstructure;   

DOI  :  10.3390/met12010097

来源: DOAJ

【 摘 要 】

Three air-hardening forging steels are presented, concerning their microstructure and their mechanical properties. The materials have been produced industrially and achieve either bainitic or martensitic microstructures by air-cooling directly from the forging heat. The bainitic steels are rather conservative steel concepts with an overall alloy concentration of approximately 3 wt.%, while the martensitic concept is alloyed with 4 wt.% manganese (and additional elements), and therefore belongs to the recently developed steel class of medium manganese steels. The presented materials achieve high strengths (YS: 720 MPa to 850 MPa, UTS: 1055 MPa to 1350 MPa), good elongations (A_u: 4.0% to 5.9%, A_t: 12.3% to 14.9%), and impact toughnesses (up to 37 J) in the air-hardened condition. It is shown that air-hardened steels achieve properties close to standard Q + T steels, while being produced with a significantly reduced heat treatment.

【 授权许可】

Unknown