Effect of Nb on the microstructure and properties of Ti-Mo microalloyed high-strength ferritic steel

被引：87
作者：
Huang, Huihui [1 ]
Yang, Gengwei [1 ]
Zhao, Gang [1 ]
Mao, Xinping [1 ,2 ]
Gan, Xiaolong [1 ,2 ]
Yin, Qilong [1 ]
Yi, Hang [1 ]
机构：
[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Hubei, Peoples R China
[2] Bao Steel Cent Res Inst, Wuhan Branch, Wuhan 430080, Hubei, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 736卷
基金：
中国博士后科学基金; 国家重点研发计划;
关键词：
Ferritic steel; High strength; Ti-Nb-Mo complex microalloying; Precipitation; Strengthening mechanism; HOT-ROLLED TI; STRAIN-INDUCED PRECIPITATION; MICRO-ALLOYED STEELS; MECHANICAL-PROPERTIES; INTERPHASE PRECIPITATION; PHASE-TRANSFORMATION; SOLUBILITY PRODUCTS; COILING TEMPERATURE; GRAIN-REFINEMENT; NIOBIUM-CARBIDE;
D O I：
10.1016/j.msea.2018.08.092
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effects of Nb on the microstructure and mechanical properties of Ti-Mo microalloyed high strength ferritic steel were systematically investigated. It was found that Nb addition inhibited the bainite transformation and was beneficial for obtaining ferritic steel. Further, Nb accelerated the precipitation in austenite and finer ferrite grains were obtained in Ti-Nb-Mo steel. The strengthening mechanism analysis results of experimental steels showed that the precipitation hardening effect of the (Ti, Mo, Nb)C particles was remarkable due to their larger volume fraction, although their average particle size was greater than that of (Ti, Mo)C in Ti-Mo steel. With the decrease of coiling temperature from 650 degrees C to 550 degrees C, the grain refinement strengthening and precipitation hardening of experimental steels increased. When the coiling temperature was 550 degrees C, the ferritic steel with superior mechanical properties was obtained by means of Ti-Nb-Mo complex microalloying. And the tensile strength, yield strength, and elongation of the Ti-Nb-Mo ferritic steel were 755 MPa, 712 MPa, and 22%, respectively.
引用
收藏
页码：148 / 155
页数：8
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