High-temperature Mechanical Properties and Strengthening Mechanism of New Secondary Hardened Steel 25CrMo3NiTiVNbZr

doi:10.11901/1005.3093.2023.516

Chinese Journal of Materials Research

2024, Vol. 38

Issue (5): 390-400 DOI: 10.11901/1005.3093.2023.516

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High-temperature Mechanical Properties and Strengthening Mechanism of New Secondary Hardened Steel 25CrMo3NiTiVNbZr

LI Ruohao¹, HU Xiaoyu², WANG Zhongcheng³, LI Hao⁴, YANG Yong⁴, XU Le¹(

), LIANG Enpu¹, HE Xiaofei¹

^1.Research Institite of Special Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China
^2.The Chinese Society for Metals, Beijing 100010, China
^3.Inner Mongolia North Heavy Industries Group, Baotou 014010, China
^4.Chongqing Changan Wangjiang Industry Group Co., Ltd., Chongqing 400020, China

Cite this article:

LI Ruohao, HU Xiaoyu, WANG Zhongcheng, LI Hao, YANG Yong, XU Le, LIANG Enpu, HE Xiaofei. High-temperature Mechanical Properties and Strengthening Mechanism of New Secondary Hardened Steel 25CrMo3NiTiVNbZr. Chinese Journal of Materials Research, 2024, 38(5): 390-400.

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Abstract

A novel secondary hardened steel 25CrMo3NiTiVNbZr was developed via optimization the chemical composition of the 25Cr3Mo3NiNbZr steel bymeans of the so called JMatpro and Thermo-Calc software. Then the microstructure, phase composition, morphology of precipitates and mechanical performance at 700℃ of the 25CrMo3NiTiVNbZr steel were characterized by means of transmission electron microscopy (TEM), electron backscattering diffraction (EBSD), while its the high-temperature streng-thening mechanism was also elucidated. The results show that the tensile strength and yield strength of 25CrMo3NiTiVNbZr steel at 700^oC are 543 MPa and 409 MPa, respectively, which are 139 MPa and 123 MPa higher than that of 25Cr3Mo3NiNbZr steel. The high-temperature strengthening of the 25CrMo3NiTiVNbZr steel may mainly ascribed to themechanism, precipitation strengthening. In the process of being stretched at 700^oC, the precipitation strengthening increment derived from the precipitation of the strengthening phase for the 25CrMo3NiTiVNbZr steel reached 367 MPa, which was 147 MPa higher than that of the 25Cr3Mo3NiNbZr steel. This is mainly due to the higher thermal stability and smaller size (average size at 7.93 nm) of the precipitated strengthening phases in the 25CrMo3NiTiVNbZr steel. After high-temperature stretching, the average size of precipitates remained at 8.14 nm.

Key words: metallic materials high temperature mechanics ingredient optimization strengthening mechanism nanoprecipitated phase

Received: 19 October 2023

ZTFLH:

TG142

Fund: Demonstration Platform for Production and Application of Agricultural Machinery Equipment and Materials(TC200H01X/05)

Corresponding Authors: XU Le, Tel: 18911259273, E-mail: xule@nercast.com

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	LI Ruohao
	HU Xiaoyu
	WANG Zhongcheng
	LI Hao
	YANG Yong
	XU Le
	LIANG Enpu
	HE Xiaofei

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.516 OR https://www.cjmr.org/EN/Y2024/V38/I5/390

Table 1 Chemical composition of test steel (mass fraction, %)

Fig.1 High-temperature tensile specimen

Fig.2 Effect of Ti on the equilibrium precipitation phase (a) 0%Ti, (b) 0.05%Ti, (c)0.1%Ti, (d) 0.15%Ti, (e) 0.2%Ti (f) 0.25%Ti

Fig.3 Effect of Mo on the equilibrium precipitation phase (a) 1.0%Mo, (b) 1.5%Mo, (c)2.0%Mo, (d) 2.5%Mo, (e) 3.0%Mo, (f) 3.5%Mo

Fig.4 Effect of V on the equilibrium precipitation phase (a) 0.1% V, (b) 0.2% V, (c) 0.3% V, (d) 0.4%V, (e) 0.5%V, (f) 0.6%V

Fig.5 Effect of Cr on the equilibrium precipitation phase (a) 3.0%Cr, (b) 2.5%Cr, (c) 2.0%Cr, (d) 1.5%Cr, (e) 1.0%Cr, (f) 0.5%Cr

Fig.6 P0 and P1 steel balance phase diagram (a) P0 steel, (b) P1 steel

Fig.7 700^oC high temperature performance of P0 and P1 steel (a) strength, (b) elongation

Fig.8 Carbide size before and after deformation at 700^oC (a, c) P0 steel before and after deformation at 700^oC, (b, d) P1 steel before and after deformation at 700^oC

Fig.9 Carbides size before and after deformation at 700^oC of P0 steel (a, b) and P1 steel (c, d)

Tbale 2M₃C phase precipitation before and after deformation at 700^oC

Table 3 MC and M₂C phase precipitation before and after deformation at 700^oC

Table 4 Average size of precipitated phase before and after deformation at 700^oC

Fig.10 EDS of P0 steel carbide

Fig.11 EDS of P1 steel carbide

Fig.12 EBSD map overlapped with outlined prior austemite grain boundaries (a) P0 steel, (b) P1 steel, and (c) the distributions of prior austenite grain size

Fig.13 Strengthening contributions at 700^oC for P0 and P1 steel (a) the calculated contribution by different factors to yield strength; (b) theoretical and experimental values

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