Effect of rare earths on impact toughness of a low-carbon steel

被引:63
作者
Liu, Hong-Liang [1 ]
Liu, Cheng-Jun [1 ]
Jiang, Mao-Fa [1 ]
机构
[1] Northeastern Univ, Sch Met & Mat, Shenyang 110004, Peoples R China
来源
MATERIALS & DESIGN | 2012年 / 33卷
关键词
Ferrous metals and alloys; Fracture; Microstructure; HIGH-STRENGTH STEELS; MECHANICAL-PROPERTIES; MICROALLOYED STEEL; PIPELINE STEEL; COOLING RATE; MICROSTRUCTURE; BEHAVIOR; THERMODYNAMICS; LANTHANUM; FRACTURE;
D O I
10.1016/j.matdes.2011.06.042
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Studies of an industrial low-carbon steel (B450NbRE) suggest that the impact toughness is unexpectedly low under its practical service, probably resulting from the unstable recovery of rare earths (RE) in steel-making. The purpose of this work is to investigate the effect of RE on the impact toughness in low-carbon steel. The B450NbRE steels with content of 0.0012-0.0180 wt.% RE were produced by vacuum induction furnace. The impact toughness and microstructure were investigated after hot rolled. The Gleeble-1500 thermal simulator was used to validate the effect of RE on the microstructure. The results indicate that the microstructure of hot-rolled steels is characterized by polygonal ferrite, quasi-polygonal ferrite, bainite and pearlite. The impact toughness increases with RE contents reaching the peak with content of 0.0047 wt.% RE, such a change exhibits the same rule as the case of the ferrite amount. However, this improvement in impact toughness is not only due to an increase in ferrite amount, but also the fine grained structure and the cleaner grain boundaries. And content of 0.0180 wt.% RE is excessive. Such an addition of the RE resulted in the martensite precipitates at the grain boundaries, which are extremely detrimental to impact toughness. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:306 / 312
页数:7
相关论文
共 32 条
[1]  
Alan D., 1992, MIN PROC EXT MET REV, V10, P307, DOI [10.1080/08827509208914093, DOI 10.1080/08827509208914093]
[2]  
[Anonymous], 2009, E23 ASTM, DOI [10.1520/E0023-07AE01, DOI 10.1520/E0023-07AE01]
[3]  
Bhadeshia H.K. D. H., 1993, Journal of Materials Science, P109
[4]   RELATIONS BETWEEN MICROSTRUCTURE AND MECHANICAL-PROPERTIES IN SECONDARY HARDENING STEELS [J].
BHAT, MS ;
GARRISON, WM ;
ZACKAY, VF .
MATERIALS SCIENCE AND ENGINEERING, 1979, 41 (01) :1-15
[5]  
Briant C. L., 1978, International Metals Reviews, V23, P164
[6]  
[陈建军 CHEN Jianjun], 2006, [稀土, Chinese rare earths], V27, P73
[7]   Effect of rare earth element yttrium addition on microstructures and properties of a 21Cr-11Ni austenitic heat-resistant stainless steel [J].
Chen, Lei ;
Ma, Xiaocong ;
Wang, Longmei ;
Ye, Xiaoning .
MATERIALS & DESIGN, 2011, 32 (04) :2206-2212
[8]   Lanthanum additions and the toughness of ultra-high strength steels and the determination of appropriate lanthanum additions [J].
Garrison, WM ;
Maloney, JL .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 403 (1-2) :299-310
[9]   DUCTILE FRACTURE [J].
GARRISON, WM ;
MOODY, NR .
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1987, 48 (11) :1035-1074
[10]   Influence of cooling rate and tempering on precipitation and hardness of vanadium microalloyed steel [J].
Gündüz, S ;
Cochrane, RC .
MATERIALS & DESIGN, 2005, 26 (06) :486-492