Designing New Forging Steels by ICMPE

Abstract

Any production is based on materials. Material properties are of utmost importance, both for productivity as well as for application and reliability of the final product. A sound prediction of materials properties thus is highly important. For metallic materials, such a prediction requires tracking of microstructure and properties evolution along the entire component process chain. In almost all nature and engineering scientific disciplines the computer simulation reaches the status of an individual scientific method. Material science and engineering joins this trend, which permits computational material and process design increasingly. The Integrative Computational Materials and Process Engineering (ICMPE) approach combines multiscale modelling and through process simulation in one comprehensive concept. This paper addresses the knowledge driven design of materials and processes for forgings. The establishment of a virtual platform for materials processing comprises an integrative numerical description of processes and of the microstructure evolution along the entire production chain. Furthermore, the development of ab initio methods promises predictability of properties based on fundamentals of chemistry and crystallography. Microalloying and Nanostructuring by low temperature phase transformation have been successfully applied for various forging steels in order to improve component performance or to ease processing. Microalloying and Nanostructuring contribute to cost savings due to optimized or substituted heat treatments, tailor the balance of strength and toughness or improve the cyclic. A new materials design approach is to provide damage tolerant matrices and by this to increase the service lifetime. This paper deals with the numerically based design of new forging steels by microstructure refinement, precipitation control and optimized processing routes.

An Overview of Fatigue Strength of Case-Hardening TRIP-Aided Martensitic Steels

“…Further increases in the mechanical properties are possible by hot-forging prior to case-hardening, which brings on an increase in retained austenite fraction and a refined microstructure. Resultantly, the hot-forging is expected to improve the toughness and fatigue strength [12,15,18], in the same way as TBF steels [71][72][73]. The use of C, Cr and Mo bearing TM steels makes easy to manufacture the hot-forged parts as drivetrains, Diesel engine common rail systems, and others [40] and resultantly achieve the lightweight and low fuel consumption, instead of conventional high-strength low alloy steels.…”

Low and Medium Carbon Advanced High-Strength Forging Steels for Automotive Applications

“…Simultaneously, many researchers are developing dual-phase type M-Mn steels with a large amount of metastable retained austenite. Unfortunately, the toughness of the M-Mn steels is lower than bainitic steels [47,53,62] (see M-Mn steel in Figure 3). The details of the Nano-B steels are described in the following Section 4.…”

“…The benefit of the bainitic steels against Q&T steel DIN-42CrMo4 is obvious since the materials never require heat-treatment after hot-forging [48]. To further improve the mechanical properties of the bainitic steels, the development of Si bearing Nano-B steels with high ductility and high toughness continues [3,4,16,40,53,62] (Figure 3). Simultaneously, many researchers are developing dual-phase type M-Mn steels with a large amount of metastable retained austenite.…”

Low and Medium Carbon Advanced High-Strength Forging Steels for Automotive Applications

“…The benefit of the bainitic steels against Q&T steel DIN-42CrMo4 is obvious since the materials never require heat-treatment after hot-forging [47]. To further improve the mechanical properties of the bainitic steels, the development of Si bearing Nano-B steels with high ductility and high toughness continues [3,4,16,41,52,62] (Figure 3). Simultaneously, many researchers are developing dual-phase type M-Mn steels with a large amount of metastable retained austenite.…”

“…Simultaneously, many researchers are developing dual-phase type M-Mn steels with a large amount of metastable retained austenite. Unfortunately, the toughness of the M-Mn steels is lower than bainitic steels [52,55,62] (see M-Mn steel in Figure 3). The details of the Nano-B steels are described in the following Sec.…”