Effect of Quenching on Mechanical Property of Ultra-high Strength Marine Engineering Steel

doi:10.11901/1005.3093.2018.341

Chinese Journal of Materials Research

2018, Vol. 32

Issue (12): 889-897 DOI: 10.11901/1005.3093.2018.341

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Effect of Quenching on Mechanical Property of Ultra-high Strength Marine Engineering Steel

Zhentuan LI, Feng CHAI(

), Caifu YANG, Xiaobing LUO, Li YANG, Hang SU

(Division of Structurale Steels, Central Iron and Steel Research Institute, Beijing 100081, China)

Cite this article:

Zhentuan LI, Feng CHAI, Caifu YANG, Xiaobing LUO, Li YANG, Hang SU. Effect of Quenching on Mechanical Property of Ultra-high Strength Marine Engineering Steel. Chinese Journal of Materials Research, 2018, 32(12): 889-897.

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Abstract

Effect of quenching processes on the mechanical property and microstructure of a newly designed ultra-high strength marine engineering steel of low carbon (C<0.05) NiCrMo was investigated by means of thermo-Calc software, optical microscopy, scanning and transmission electron microscopy. Results show that secondary hardening occurred for the steel quenched from 910℃ and then aged at 525℃, resulting in a maximum peak hardness was 369 HV, while secondary martensite microstructures emerged for the steel quenched from 910℃ and then aged at 700℃ by air cooling, resulting in a peak hardness 361 HV. Thermo-Calc calculation result revealed that the mean particle radius of (Nb, Ti)C was obviously reduced with the decreasing quenching temperature within the range of 820~910℃, and the refined (Nb, Ti) C particles could effectively suppress the growth of austenite grains, thus improving grain boundary density of high or low angle in the matrix, which led to the increment of strength and toughness. Among others, the steel quenched from 820℃ presents the highest strength up to 1084 MPa, impact energy of 76 J for V-type impact test at -80℃, and the fracture fiber rate was up to 100%. Fractograph- and crack propagation-observation showed that the refinement of microstructure and second phase could hinder the expansion and fracture of dimples, while the refined martensite packet and block could significantly alter the crack propagation direction. Finally, the steel quenched from 820℃ presents the maximum unit length of 15 μm for the crack propagation path, implying a high toughness of the steel.

Key words: metallic materials low carbon ultra-high strength marine engineering steel quenching temperature microstructure refinement crack propagation

Received: 20 May 2018

Fund: Supported by National Basic Research Program of China (No. 2017YFB0703002)

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	Zhentuan LI
	Feng CHAI
	Caifu YANG
	Xiaobing LUO
	Li YANG
	Hang SU

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.341 OR https://www.cjmr.org/EN/Y2018/V32/I12/889

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

Fig.1 Relationship between hardness of alloy and aging temperatures

Fig.2 Microstructure of alloys with different aging temperature (a) 450℃, (b) 525℃, (c) 600℃, (d) 700℃

Fig.3 Effect of quenching temperature on mechanical property of the tested steel (a) effect of quenching temperature on strength, (b) effect of quenching temperature on -80℃ A_kv

Fig.4 Grain, microstructure morphology and grain size distribution frequency of alloy with different quenching temperatures (a, b) grain morphology of 820℃ and 910℃ quenching; (c, d) microstructure morphology of 820℃、910℃ quenching, (e) grain size distribution frequency image

Fig.5 Effect of aging temperature on microstructure of sample (a) rich zone of lath and grain boundary alloying elements; (b) spectrum analysis image; (c) morphology of reversed austenite at 600℃ aging; (d) selected-area electron diffraction of position A

Fig.6 Content of each phase of sample in the equilibrium state

Fig.7 TEM morphology of (Nb,Ti)C and energy spectrum analysis image (a) morphology of (Nb,Ti)C; (b) spectrum analysis image

Fig.8 Effect of quenching temperature and time on mean radius of (Nb,Ti)C

Fig.9 Grain boundary distribution maps of sample after quenching at 820℃ (a) and 910℃ (b)

Fig.10 Grain boundary density distribution map of sample with different quenching temperature

Fig.11 Fractographs of impact toughness tested samples (a, b) macroscopic and microscopic fractograph at 550℃ aging after 820℃ quenching; (c, d) macroscopic and microscopic fractograph at 550℃ aging after 910℃ quenching; (e) morphology of (Nb,Ti)(N,C) in the dimple; (f) spectrum analysis

Fig.12 SEM image and EBSD analysis of crack propagation of 820℃ quenching (a) 820℃ SEM image; (b) 820℃ EBSD image; (c) point-to-point misorientation of AB line; (d) point-to-point misorientation of CD line

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