Improvement of Strength and Oxidation Resistance at High Temperature in AISI 4140 Steel by Micro-Alloying Chromium and Tungsten for Automotive Engine Applications

• Autorzy: Kim Hyo-Seong , Kang Moonseok , Park Minha , Kim Byung Jun , Kim Byoungkoo , Ahn Yong-Sik

Identyfikatory

DOI

10.24425/amm.2024.147786

• Języki publikacji: EN

Abstrakty

EN

Increasing the operating temperature and pressure of an automotive engine and reducing its weight can improve fuel efficiency and lower carbon dioxide emissions. These can be achieved by changing the engine piston material from conventional aluminum alloy to high-strength heat-resistant steel. American Iron and Steel Institute 4140 modified steels (AISI 4140 Mod.s), which have improved strength, oxidation resistance, and wear resistance at high temperature were developed by adjusting the AISI 4140 alloy compositions and optimizing the heat treatment process for automotive engine applications. In this study, the effects of modifying alloy compositions on the microstructure, mechanical properties (both at room and high temperatures), and oxidation of AISI 4140 Mod.s were investigated. Effective grain refinement occurred due to the influence of high-temperature stable carbide forming elements such as Mo, and V. The bainite structure changed to martensite structure under the influence Cr and Ni. As the Cr and W contents increased, the oxidation resistance was improved, and the oxide layer thickness decreased after 10 hours exposure at 500°C. The AISI 4140 Mod. exhibited a 35% improvement in room temperature strength, 70% improvement in high-temperature strength, and 40% improvement in high-temperature oxidation resistance compared to conventional AISI 4140.

Słowa kluczowe

EN

AISI 4140; micro-alloying; microstructure; mechanical property; heat-treatment

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2024
• Tom: Vol. 69, iss. 1
• Strony: 61--65
• Opis fizyczny: Bibliogr. 13 poz., fot., rys., tab.

Twórcy

autor

Kim Hyo-Seong

• Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea
• Pukyong National University, Department of Materials Science and Engineering, 48547, Busan, Republic of Korea
• HD Korea Shipbuilding & Offshore Engineering, 44032, Ulsan, Republic of Korea

• https://orcid.org/0000-0002-9965-5925

autor

Kang Moonseok

• Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea

• https://orcid.org/0000-0002-8208-2438

autor

Park Minha

• Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea

• https://orcid.org/0000-0001-6229-185X

autor

Kim Byung Jun

• Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea

• https://orcid.org/0000-0002-7205-0045

autor

Kim Byoungkoo

• Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea

• https://orcid.org/0000-0002-5392-5862

autor

Ahn Yong-Sik

• Pukyong National University, Department of Materials Science and Engineering, 48547, Busan, Republic of Korea

• https://orcid.org/0000-0002-5250-1689

Bibliografia

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Uwagi

The materials and mechanical test of this study was supported by the International joint technology development project (P155500021, Development of eco-friendly high-performance forged parts manufacturing technology based on AI intelligent plastic processing system) funded by the Ministry of Trade, Industry & Energy (MI, Republic of Korea) and the analysis (microstructure, chemical composition analysis) of this study was supported by the Technology Innovation Program (20206500000020, Development of wear-resistant hard-facing materials and processes for NPP valve seat and disc) funded by the Ministry of Trade, Industry & Energy (MI, Republic of Korea). The funding source was not involved in in study design; in the collection, analysis, and interpretation of data; in the writing of the report; and in the decision to submit the article for publication.