Achieving high tensile properties and impact toughness in ultrahigh strength lean alloy steel by quenching and partitioning treatment

• Autorzy: Wang Lirong , Liang Yilong , Zhao Fei , Xu Fahong , Lei Lei , Long Shaolei , Yang Ming , Jiang Yun

Identyfikatory

DOI

10.1007/s43452-023-00841-1

• Języki publikacji: EN

Abstrakty

EN

In this study, a desirable combination of strength, ductility, and toughness in low-carbon 30CrMnSiA steel is achieved by a hierarchical multiphase microstructural architecture subjected to one- and two-step quenching and partitioning (Q&P) processes. The microstructural constituents are studied by EBSD, x-ray diffraction, dilatometry, and TEM. Experimental results show that microstructural refinement occurs in the martensite and bainite at a lower quenching temperature, where more Bain groups form in one close-packed plane group. This causes random distribution between martensite and bainite blocks, enlarging the volume of high-angle grain boundaries. Such refined microstructure, particularly for the increased martensite with higher-density dislocations, causes an increased strength at a decreased quenching temperature. By comparison, increased quenching and partitioning temperature produces more stable film-like retained austenite (RA) and a low dislocation density in martensite/bainite (M/B); thus, it provides better deformation by accommodating with M/B laths and absorbing substantial energy due to the transformation-induced plasticity effect. The lower dislocation density, the higher volume fraction of RA, and the higher HAGBs improve the impact toughness and tensile properties of lean alloy steel through a moderate Q&P process.

Słowa kluczowe

EN

multiphase microstructure; one-step quenching partitioning process; two-step quenching partitioning; impact toughness; tensile properties

PL

mikrostruktura; hartowanie; właściwości rozciągające

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2024
• Tom: Vol. 24, no. 1
• Strony: art. no. e32, 2024
• Opis fizyczny: Bibliogr. 52 poz., rys., wykr.

Twórcy

autor

Wang Lirong

• School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China

autor

Liang Yilong

• School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China

autor

Zhao Fei

• School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China

autor

Xu Fahong

• Guizhou Special Equipment Inspection and Testing Institute, Guiyang 550025, China

autor

Lei Lei

• School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou 434023, China

autor

Long Shaolei

• School of Mechanical Engineering, Guizhou Institute of Technology, Guiyang 550003, China

autor

Yang Ming

• School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China

• https://orcid.org/0000-0001-5713-2213

autor

Jiang Yun

• School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025)