Authors

D. Petrell, B. Gehrmann, VDM Metals International GmbH, Altena; T. Storch,  A. Kauffmann, G. Laplanche, Institute for Materials, Ruhr University Bochum

Year

2026

Print Info

Production/Publication ÖVK

Summary

The knowledge about manufacturing and processing stainless steel, which emerged at the beginning of the 20th century, enabled modern society to explore routes and regions beyond the rail network. Even in the 21st century, vehicles with efficient internal combustion engines remain an attractive solution from many perspectives. This is due to the significant weight disadvantage of battery-powered vehicles and the fact that electricity generation is CO₂‑intensive and location-dependent. Using turbochargers is a promising approach to increase the thermal efficiency of internal combustion powertrains. State‑of‑the‑art technology and innovative turbocharger designs can result in component temperatures of up to 1000 °C. Unlike the superalloys Unified Numbering System (UNS) N07001 (also known as Waspaloy) and UNS N07263 (DIN 2.4650, also called Nimonic C‑263) from the 1950s, new superalloys such as DIN 2.4750 (C‑264) and 2.4795 (C‑295) offer improved creep and fatigue resistance at very high temperatures, combined with high strain to fracture across the entire temperature range. Improvements in the high‑temperature mechanical properties are achieved by increasing the γ'‑solvus temperature and avoiding the formation of brittle, intermetallic phases during service. Adjusting the Ti and Al content and using W as an additional alloying element leads to a significant improvement in creep resistance and fatigue strength at temperatures above 900 °C for the superalloys DIN 2.4750 and 2.4795 compared to DIN 2.4650. The enhanced mechanical properties of 2.4795 compared to DIN 2.4750 come at the expense of slightly reduced oxidation resistance.

ISBN

978-3-9504969-5-6

DOI

https://doi.org/10.62626/a7r3-ka4a Copy link

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