Relationship Between Mechanical Behavior and Microstructure for an Ultra-high Strength Maraging Steel

doi:10.11901/1005.3093.2018.707

Chinese Journal of Materials Research

2019, Vol. 33

Issue (9): 641-649 DOI: 10.11901/1005.3093.2018.707

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Relationship Between Mechanical Behavior and Microstructure for an Ultra-high Strength Maraging Steel

FENG Jiawei^1,²,NIU Mengchao^1,²,WANG Wei¹(

),SHAN Yiyin¹,YANG Ke¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China

Cite this article:

FENG Jiawei,NIU Mengchao,WANG Wei,SHAN Yiyin,YANG Ke. Relationship Between Mechanical Behavior and Microstructure for an Ultra-high Strength Maraging Steel. Chinese Journal of Materials Research, 2019, 33(9): 641-649.

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Abstract

Precipitate evolution during aging process as well as its effect on mechanical properties of a 2.4 GPa grade ultra-high strength maraging steel was investigated by means of high resolution transmission electron microscope (HRTEM) and atom probe tomography (APT). It was found that at the initial stage of aging Ni and Ti atoms segregated rapidly and Ni-Ti clusters formed in the matrix. At the peak-aging time the Ni-Ti clusters transformed into Ni₃Ti, and the Mo-rich phase appeared at the Ni₃Ti/matrix interface. With extension of the aging time Ni₃Ti phase started to coarsen and the Mo-rich phase transformed into Ni₃Mo. Mechanical property tests show that the ultimate tensile strength increased firstly and then started to decrease after peak-aging time. A mutually exclusive relation between the ultimate tensile strength and fracture toughness was found, especially, when the aging time was 4 h the ultimate tensile strength reached to the maximum value of 2560 MPa, however the fracture toughness decreased down to the minimum value of 20 MPa·m^1/2. Finally, the effect of the morphology of the precipitates on both the strength and fracture toughness is discussed based on the results of the precipitates evolution during aging process.

Key words: matallic materials maraging steel microstructure mechanical property

Received: 13 December 2018

ZTFLH:

TG142.41

Fund: National Natural Science Foundation of China(51201160);National Natural Science Foundation of China Research Fund for International Young Scientists(51750110515);Youth Innovation Promotion Association of Chinese Academy of Sciences(2017233)

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	Jiawei FENG
	Mengchao NIU
	Wei WANG
	Yiyin SHAN
	Ke YANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.707 OR https://www.cjmr.org/EN/Y2019/V33/I9/641

Table 1 Parameters applied in the maximum separation analysis

Fig.1 TEM image (a) and [001]_M diffraction pattern (b) of cryogenically treated experimental maraging steel

Fig.2 Ni (a), Ti (b), Co (c) and Mo (d) atoms mapping and corresponding nearest neighbor analysis results in the analytical body (20 nm×20 nm×50 nm) after cryogenic treatment

Fig.3 Ni (a), Ti (b), Mo (c), Ni+Ti+Mo (d) atoms mapping in an analytical body (30 nm×30 nm×60 nm) and isoconcentration surface for regions containing more than 35%Ni+Ti+10%Mo+Fe (e) for the sample aged at 480℃ for 10 min

Fig.4 Ni (a), Ti (b), Mo (c) and Ni+Ti+Mo (d) atoms mapping inan analytical body (30 nm×30 nm×60 nm) and isoconcentration surface for regions containing more than (e) 35%Ni+Ti+10%Mo+Fe for the sample aged at 480℃ for 4 h

Fig.5 3-D atoms mapping (a) in Fig.4e and corresponding 1-D concentration profile (b) of the selected region (6 nm×6 nm×18 nm)

Fig.6 Ni (a), Ti (b), Mo (c) and Ni+Ti+Mo (d) atoms mapping in the analytical body (30 nm×30 nm×60 nm) and isoconcentration surface for regions containing more than (e) 35%Ni+Ti+10%Mo+Fe for the sample aged at 480℃ for 48 h

Fig.7 High-resolution images of Ni₃Ti (a) and Ni₃Mo(c), and their corresponding FFT of Ni₃Ti (b) and Ni₃Mo (d) in the sample aged at 480℃ for 96 h

Fig.8 Tensile properties and fracture toughness of experimental maraging steel under different heat treatment conditions

Fig.9 XRD analysis results of theexperimental maraging steel aged at 480℃ for different times (a) XRD patterns of matrix; (b) function of volume fraction of reverted austenite with aging time

Fig.10 Schematic of evolution of precipitations in 2.4 GPa grade maraging steel during aging at 480℃

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