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Chinese Journal of Materials Research  2018, Vol. 32 Issue (5): 388-394    DOI: 10.11901/1005.3093.2017.193
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Effect of Quenching Temperature on Cryogenic Mechanical Properties of a 7Ni Steel
Hongwei CAO1,2, Xinghong LUO2(), Shi LIU2
1 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
2 CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China
Cite this article: 

Hongwei CAO, Xinghong LUO, Shi LIU. Effect of Quenching Temperature on Cryogenic Mechanical Properties of a 7Ni Steel. Chinese Journal of Materials Research, 2018, 32(5): 388-394.

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Abstract  

The effect of quenching temperature on cryogenic strength and toughness of a 7Ni steel was investigated. The microstructure and volume fraction of reversed austenite were characterized by means of OM, SEM, TEM, XRD. Results show that cryogenic toughness of the steel sharply decreased when quenching temperature increased from 830℃ to 930℃. And cryogenic tensile strength as well as yield strength were obviously decreased with increasing quenching temperature. What's more, elongation also decreased at higher quenching temperature, and has a consistent variation tendency with cryogenic strength. Grains of prior austenite and martensite packets were fine in the steel quenched at 830℃, but grains and packets grew significantly at higher quenching temperature. Cryogenic strength and toughness decreased with growth of grain sizes and packet width. Coarsen microstructure has a adverse effect on cryogenic strength and toughness. The amount of reversed austenite showed downtrend basically by increasing quenching temperature. The steel quenched at 830℃ has a maximum of reversed austenite amount and impact energy.
Key words:  metallic materials      7Ni steel      quenching temperature      cryogenic mechanical properties      microstructure      reversed austenite     
Received:  17 March 2017     
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Hongwei CAO
Xinghong LUO
Shi LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.193     OR     https://www.cjmr.org/EN/Y2018/V32/I5/388

C Si Mn P S Ni Fe
0.04 0.05 0.83 0.009 <0.005 7.49 Bal.
Table 1  Chemical composition of experimental steel (mass fraction, %)
Fig.1  Effect of quenching temperature on cryogenic tensile properties of samples
Fig.2  Effect of quenching temperature on cryogenic toughness of samples
Fig.3  Impact fracture morphology of samples quenched at different temperature, (a) 830℃, (b) 880℃, (c) 930℃
Fig.4  Prior austenite grains of samples quenched at different temperatures, (a) 830℃, (b) 880℃, (c) 930℃
Fig.5  Microstructure of samples quenched at different temperatures, (a) 830℃, (b) 880℃, (c) 930℃
Fig.6  Effect of quenching temperature on grain size and packet width
Fig.7  Effect of quenching temperature on volume fraction of reversed austenite
Fig.8  TEM images and SAED patterns of samples quenched at different temperatures, (a) 830℃, (b) 880℃, (c) 930℃
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