Abstract
This paper presents the microstructural and mechanical properties of low and medium carbon advanced high-strength forging steels developed based on the third generation advanced high-strength sheet steels, in conjunction with those of conventional high-strength forging steels. Hot-forging followed by an isothermal transformation process considerably improved the mechanical properties of the forging steels. The improvement mechanisms of the mechanical properties were summarized by relating to the matrix structure, the strain-induced transformation of metastable retained austenite, and/or a mixture of martensite and austenite.
Highlights
Conventional high-strength forging steels (CFSs) are necessary for the production of automotive powertrain and chassis parts
Most of the CFSs are generally subjected to the heat-treatment of quenching and tempering (Q&T) after cold- or hot-forging to increase the yield stress, impact toughness, fatigue strength, etc
This paper introduces the microstructural and mechanical properties of the prospective low and medium carbon advanced high-strength forging steels (AFSs) with bainitic ferrite and/or martensite matrix structure and metastable retained austenite, along with the low and medium carbon CFSs
Summary
Conventional high-strength forging steels (CFSs) are necessary for the production of automotive powertrain and chassis parts. Because the Q&T treatment is expensive, modified V-microalloying precipitation hardening ferritic/pearlitic (PHFP-M) steels and bainitic steels subjected to hot-forging and controlling cooling were developed to eliminate the additional Q&T treatment [1,2,3,4]. Both the steels are applied to the automotive powertrain and chassis forging parts, their mechanical properties are inferior to those of Q&T steels. This paper does not include various properties of dual-phase type M-Mn [24,25] and maraging-TRIP steels [27], because heat-treatment process and chemical composition of both the steels are great different from those of the other AFSs
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