The effect of niobium-vanadium composite microalloying on the strength and toughness of hot press forming steel

DOI

10.2991/978-94-6463-581-2_36How to use a DOI?

Keywords

Niobium-vanadium; Composite microalloying; Hot press forming steel; Strength and toughness; Grain refinement

Abstract

This article investigates the effect of niobium-vanadium composite microalloying on the strength and toughness of hot press forming steel. The mechanical properties, laminated impact property, ultimate tip cold bending property, and high-speed tensile property of traditional 22MnB5 and niobium-vanadium composite micro alloyed 22MnB5 steels were measured, and the metallographic microstructure and microstructure under EBSD were observed. The results show that the hot press forming steel with Nb-V composite microalloying has a slight increase in elongation while significantly improving yield strength and tensile strength. During high-speed tension, hot press forming steel with Nb-V composite microalloying exhibits high strain rate sensitivity, which means the yield strength increases more significantly with the increasing of strain rate. Laminated impact energy (V-notch Charpy impact energy) increased by 5.5%. The extreme sharp cold bending angle of 22MnB5 has been increased from 55–60 to 65–70 (measured value under without decarburization layer). These property improvements are closely related to Nb-V composite microalloying, which can refine austenite grains, martensite bundle and martensite lath after quenching. Nb-V composite microalloying can more effectively refine carbide precipitation, and the dissolution of vanadium carbides during quenching heating can also effectively improve the hardenability of hot press forming steel, improve the quenching technological properties of hot press forming steel.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Mingtu Ma
AU  - Yan Zhao
AU  - Guangyao Wang
AU  - Jingwei Li
AU  - Bo Li
AU  - Kejian Li
AU  - Pengjun Cao
PY  - 2024
DA  - 2024/12/07
TI  - The effect of niobium-vanadium composite microalloying on the strength and toughness of hot press forming steel
BT  - Proceedings of the 7th International Conference on Advanced High Strength Steel and Press Hardening (ICHSU 2024)
PB  - Atlantis Press
SP  - 288
EP  - 295
SN  - 2590-3217
UR  - https://doi.org/10.2991/978-94-6463-581-2_36
DO  - 10.2991/978-94-6463-581-2_36
ID  - Ma2024
ER  -