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| Effects of rare earth on low temperature impact toughness of HRB400E rebar |
| WEI Shu-hao1,2,3, LU Heng-chang1,2,3, LIU Teng-shi1,2,3, WANG Chang-cheng4,5, XIE Ji-xiang4, DONG Han1,2,3 |
1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;
2. Zhejiang Institute of Advanced Materials, Shanghai University, Jiashan 314113, Zhejiang, China;
3. Shanghai University New Materials(Taizhou)Research Institute Co., Ltd., Taizhou 225599, Jiangsu, China;
4. Yancheng Lianxin Steel Co., Ltd., Yancheng 224145, Jiangsu, China;
5. Guangxi Shenglong Metallurgical Co., Ltd., Fangchenggang 530022, Guangxi, China |
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Abstract Industrial tests were carried out to produce HRB400E rebar with rare earth mass fraction of 0%, 0.016 8%, 0.028 5% and 0.037 0%, and low temperature impact tests were carried out using DVN (Direct V-notched) impact specimens to investigate the effect of rare earth content on low temperature impact toughness of HRB400E rebar. The microstructure and inclusion characteristics, chemical composition and size of rebar before and after rare earth treatment were characterised with the aid of OM, SEM, EDS and Explorer 4 Analyzer. The results show that low-temperature impact toughness of test steels at -20, -40, -60 ℃ tends to increase and then decrease with increasing rare earth content. Test steel with 0.016 8% rare earth mass fraction has the best low temperature impact toughness. The impact energy of test steel with 0.016 8% rare earth at -20 ℃ is 276 J, an increase of 117% compared to the test steel without rare earth. Without the addition of rare earth, the inclusions in test steel are mainly MnS, MnO-SiO2 and Al2O3, while the addition of 0.016 8% rare earth results in a significant decrease in the quantity percentages of MnO-SiO2 and Al2O3 and a significant increase in the quantity percentage of MnS in the test steel. Small size and relatively regular shape of rare earth composite inclusions are formed, which prevent the emergence and expansion of cracks and improve the low temperature impact toughness of test steel. However, addition of excessive rare earths leads to an increase in the size of rare earth inclusions in test steel, and the large size of rare earth inclusions promotes crack expansion, which has a negative effect on low temperature impact toughness of test steel.
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Received: 21 March 2022
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2022, Vol. 32 
