Low-temperature mechanical and magnetic properties of the reduced activation martensitic steel

doi:10.1007/s11706-015-0302-z

Front. Mater. Sci.

2015, Vol. 9

Issue (3) : 264-271 https://doi.org/10.1007/s11706-015-0302-z

RESEARCH ARTICLE

Low-temperature mechanical and magnetic properties of the reduced activation martensitic steel

Hui-Li DING¹,Tao ZHANG^1,^*(

),Rui GAO¹,Xian-Ping WANG¹,Qian-Feng FANG^1,^*(

),Chang-Song LIU¹,Jin-Ping SUO²

1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
2. School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

Mechanical and magnetic properties as well as their relationship in the reduced activation martensitic (RAM) steel were investigated in the temperature range from --90°C to 20°C. Charpy impact tests show that the ductile-to-brittle transition temperature (DBTT) of the RAM steel is about --60°C. Low-temperature tensile tests show that the yield strength, ultimate tensile strength and total elongation values increase as temperature decreases, indicating that the strength and plasticity below the DBTT are higher than those above the DBTT. The coercive field (H_C) in the scale of logarithm decreases linearly with the increasing temperature and the absolute value of the slope of lnH_C versus temperature above the DBTT is obviously larger than that below the DBTT, also confirmed in the T91 steel. The results indicate that the non-destructive magnetic measurement is a promising candidate method for the DBTT detection of ferromagnetic steels.

Keywords reduced activation martensitic (RAM) steel ductile-to-brittle transition temperature (DBTT) mechanical property magnetic property non-destructive detection

Corresponding Author(s): Tao ZHANG,Qian-Feng FANG

Online First Date: 02 June 2015 Issue Date: 23 July 2015

Cite this article:

Hui-Li DING,Tao ZHANG,Rui GAO, et al. Low-temperature mechanical and magnetic properties of the reduced activation martensitic steel[J]. Front. Mater. Sci., 2015, 9(3): 264-271.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-015-0302-z
https://academic.hep.com.cn/foms/EN/Y2015/V9/I3/264

Fig.1 OM images of the RAM steel at different magnification.

Fig.2 The TEM image for the microstructure of the RAM steel and the EDS analysis of particles.

Fig.3 Engineering stress–strain curves of the RAM steel tested at different temperatures.

Fig.4 Variations of YS, UTS and TE with the tensile temperature.

Fig.5 SEM images of the fracture section for the RAM tensile-tested at different temperatures: (a) 20°C; (b) -60°C; (c) -70°C; (d) -90°C.

Fig.6 SEM images of the fractured surfaces for the RAM steel Charpy-impact tested at two temperatures: (a) 10°C; (b) -70°C.

Fig.7 The coercive field and the Charpy impact absorbed energy for the RAM steel at different temperatures.

Fig.8 The coercive field and the Charpy impact absorbed energy for the T91 steel at different temperatures.

Tab.1

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