Effect of Ti microalloying on carbide precipitation behavior and high temperature strength of 25Cr3Mo3NiNbZr steel

doi:10.13251/j.issn.0254-6051.2023.11.005

Abstract

Abstract: Effect of Ti microalloying on carbide precipitation behavior, microstructure and high temperature strength of the 25Cr3Mo3NiNbZr steel was investigated by means of optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), Thermo-Calc thermodynamic calculation, physicochemical phase analysis and high temperature (700 ℃) tensile test. The results show that due to the micro-addition of Ti, the prior austenite grain size of the tested steel is refined from 50 μm to 20 μm, the high temperature (700 ℃) tensile strength and yield strength are increased by 176 MPa and 54 MPa. After the addition of Ti, the number density of MC-type carbide in the steel increases from 4.36×10¹⁵ m^-3 to 5.34×10¹⁹ m^-3, and the proportion of MC-type carbide in the size of 5-10 nm increases from 81.8% to 90.1%, and the MC-type carbide in the size range of 1-5 nm also increases. In addition, due to the addition of Ti, the thermal stability of MC carbides is improved, and the coarsening rate is reduced from 0.301 978 nm·s^-1/3 to 0.169 049 nm·s^-1/3. The addition of Ti makes the MC-type carbide in the tested steel smaller in size, denser and more stable, which is the main reason for the improvement of the high temperature strength of the tested steel.

Key words: Ti microalloying, high temperature strength, carbide, precipitation behavior, thermal stability

CLC Number:

TG142

Lu Maoyong, Xu Le, Li Hao, Liang Enpu, Li Ruohao, Wu Run. Effect of Ti microalloying on carbide precipitation behavior and high temperature strength of 25Cr3Mo3NiNbZr steel[J]. Heat Treatment of Metals, 2023, 48(11): 29-37.

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