Effect of Quenching Cooling Rate on Mechanical Properties of a Ni-Cr-Mo-B Steel for Offshore Platform

doi:10.11901/1005.3093.2021.275

Chinese Journal of Materials Research

2022, Vol. 36

Issue (4): 250-260 DOI: 10.11901/1005.3093.2021.275

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Effect of Quenching Cooling Rate on Mechanical Properties of a Ni-Cr-Mo-B Steel for Offshore Platform

ZHANG Shouqing¹^,², HU Xiaofeng¹(

), DU Yubin¹^,², JIANG Haichang¹, PANG Huiyong³, RONG Lijian¹

^1.CAS Key Laboratory of Nuclear Materials and Safety Assessment, 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, Shenyang 110016, China
^3.Wuyang Iron and Steel Co. Ltd., Pingdingshan 462500, China

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ZHANG Shouqing, HU Xiaofeng, DU Yubin, JIANG Haichang, PANG Huiyong, RONG Lijian. Effect of Quenching Cooling Rate on Mechanical Properties of a Ni-Cr-Mo-B Steel for Offshore Platform. Chinese Journal of Materials Research, 2022, 36(4): 250-260.

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Abstract

The effect of quenching cooling rate on the microstructure, effective grain size (EGS) and mechanical properties of a Ni-Cr-Mo-B steel for offshore platform was investigated by means of dilatometer, SEM, EBSD, in combination with hardness, tensile and impact tests. The results show that the microstructures of the steel by different cooling rates mainly include lath martensite (LM), lath bainite (LB), granular bainite (GB) and ferrite (F). With the decrease of cooling rate the microstructures of the steel can be LM (>20℃/s), LM/LB (20~2℃/s), LB (2~1℃/s), LB /GB (1~0.2℃/s) and GB/F (0.2~0.02℃/s). Meanwhile, the hardness gradually decreases from 393HV by 100℃/s to 291HV by 0.02℃/s. After tempered, the yield strength decreases from 836 MPa for water-cooled steel to 726 MPa for furnace-cooled steel, while the elongation almost keeps constant around about 20%. Impact energy at -60℃ for oil-cooled steel is the highest about 199 J, followed by water-cooled steel (54 J), and the air-cooled and furnace-cooled steels exhibit the lowest impact energy (<30 J). This is because the microstructure of oil-cooled steel is LM_T/LB_T, which has the smallest EGS (1.6 μm) and the strongest effect of hindering the crack growth. However, the air-cooled and furnace-cooled steels present microstructures GB_T/LB_T and GB_T/F respectively, which show the larger EGS (2.4 and 2.8 μm) and the weaker effect of hindering the crack growth.

Key words: metallic materials Ni-Cr-Mo-B steel microstructure cooling rate effective grain size impact energy

Received: 29 April 2021

ZTFLH:

TG142.1

Fund: National Key Research and Development Program of China(2016YFB0300601);Liaoning Revitalization Talents Program(XLYC1907143);Strategic Priority Research Program of Chinese Academy of Sciences(XDC04000000);Liaoning Natural Science Foundation(2020-MS-008)

About author: HU Xiaofeng, Tel: (024)23971985, E-mail: xfhu@imr.ac.cn

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	Shouqing ZHANG
	Xiaofeng HU
	Yubin DU
	Haichang JIANG
	Huiyong PANG
	Lijian RONG

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.275 OR https://www.cjmr.org/EN/Y2022/V36/I4/250

Table 1 Chemical compositions of the test steel (mass fraction / %)

Fig.1 Schematic diagram of heat treatment process of experimental steels

Fig.2 Low magnified SEM images of experimental steels by different cooling rates (LM-lath martensite; LB-lath bainite; GB-granular bainite; F- ferrite; PAGB-prior austenite grain boundary). (a) 100℃/s (b) 20℃/s (c) 10℃/s (d) 5℃/s (e) 2℃/s (f) 1℃/s (g) 0.5℃/s (h) 0.2℃/s (i) 0.02℃/s

Fig.3 Locally magnified SEM images of the zones marked by solid lines in Fig.2. (Fig.3a is the magnified image of the zone ‘A’ in Fig.2a. Fig.3b is the magnified image of the zone ‘B’ in Fig.2c. Figs.3c and 3d are the magnified images of the zones ‘C’ and ‘D’ in Fig.2h, respectively. Figs.3e~g are the magnified images of the zones ‘E’, ‘F’ and ‘G’ in Fig.2i, respectively)

Fig.4 SEM images of tempered experimental steels after cooling by water (a, b), oil (c, d), air (e~g) and furnace (h~j), respectively. Fig.4b is the magnified image of the zone ‘A’ in Fig.4a. Fig.4d is the magnified image of the zone ‘B’ in Fig.4c. Figs.4f and 4g are magnified images of the zones ‘C’ and ‘D’ in Fig.4e, respectively. Figs.4i and 4j are magnified images of the zones ‘E’ and ‘F’ in Fig.4h (LM_T-tempered lath martensite; LB_T-tempered lath bainite; GB_T-tempered granular bainite; F-ferrite)

Fig.5 Calculated phase volume percentage of experimental steels against tempering time at 630℃

Fig.6 CCT diagrams of experimental steels

Fig.7 Grain boundary distribution maps of experimental steels after cooling by water (a), oil (b), air (c) and furnace (d) (Boundaries are indicated by three color solid lines, with red line being misorientation of 2~15°, black line 15~50°, and blue line >50° and Green areas in Fig.7c and d represent retained austensite)

Fig.8 Grain boundary distribution maps of tempered experimental steels after cooling by water (a), oil (b), air (c) and furnace (d) (Boundaries are indicated by three color solid lines, with red line being misorientation of 2~15°, black line 15~50°, and blue line >50° and Green areas in Fig.8c and Fig.8d represent retained austensite)

Fig.9 Relationship between prior austenite grain sizes, the effective grain sizes before and after tempered and the cooling ways for experimental steels

Fig.10 Relationship between yield strength, tensile strength, elongation at room temperature, impact energy at -60℃ after tempered and the cooling ways for experimental steels

Fig.11 SEM fractographs of Charpy impact samples of tempered experimental steels after cooling with different way (The zones marked by dotted lines are cleavage areas. Figs.11b, d, f, h are magnified images of the zones marked by dotted lines in Figs.11a, c, e, g, respectively)

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