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材料导报  2022, Vol. 36 Issue (14): 21030261-6    https://doi.org/10.11896/cldb.21030261
  金属与金属基复合材料 |
淬火温度对超超临界火电站用COST-FB2钢显微组织和室温强度的影响
殷会芳, 赵吉庆, 杨钢
钢铁研究总院,特殊钢研究院,北京 100081
Effect of Quenching Temperature on Microstructures and Room Temperature Strength of COST-FB2 Steel Used in Ultra-supercritical Coal-fired Power Plants
YIN Huifang, ZHAO Jiqing, YANG Gang
Research Institute for Special Steel, Central Iron and Steel Research Institute, Beijing 100081, China
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摘要 COST-FB2钢因具有优越的高温持久性能而被广泛应用在620 ℃超超临界火电站机汽轮机转子上。本工作对取自国内首支自主研发制备的20 t级COST-FB2钢转子大锻件本体的试样进行了不同温度淬火和两次回火的热处理,并测试了其力学性能,研究了淬火温度对COST-FB2钢微观组织的影响。结果表明:在1 000~1 150 ℃内,随着淬火温度升高,COST-FB2钢的强度和硬度不断增加,塑性整体变化不大,冲击功由10 J增大至23.5 J 后又开始减小;COST-FB2钢的平均晶粒尺寸由65.5 μm 增加到212.1 μm,马氏体板条块宽度由4.75 μm 增加至6.06 μm,位错密度由4.8×109 cm-2增加至11.8×109 cm-2。通过强化增量计算推断析出强化和位错强化的增量是COST-FB2钢回火后室温屈服强度增加的主要原因; 将晶界强化和马氏体板条块界强化分别与基体强度、析出强化和位错强化增量之和叠加,得出马氏体板条块界强化增量叠加值更接近试验屈服强度值。该研究结果能够为COST-FB2钢大锻件整体热处理提供参考,助力大锻件的国产化。
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殷会芳
赵吉庆
杨钢
关键词:  COST-FB2钢  淬火温度  组织和力学性能  强化机制    
Abstract: COST-FB2 steel is commonly used in the turbine rotors of ultra-supercritical power plants owing to its excellent high temperature creep strength. The samples used in this work were cut from the body area of a 20-ton of COST-FB2 steel forging rotor that China independently developed. Quenching at different temperatures and two-step tempering were realized for the heat treatment of COST-FB2 steel. Then, the mechanical properties of the steel were tested, and the effect of quenching temperature on the microstructure of COST-FB2 steel was characterized. The results demonstrate that when the quenching temperature increased from 1 000 ℃ to 1 150 ℃, the hardness and the strength of COST-FB2 steel increased continuously while the plasticity varied slightly and the impact energy first increased from 10 J to 23.5 J but then decreased. When the quenching temperature increased from 1 000 ℃ to 1 150 ℃, the prior austenite grain (PAG) size of COST-FB2 steel increased from 65.5 μm to 212.1 μm, the block width increased from 4.75 μm to 6.04 μm, and the dislocation density increased from 4.8×109 cm-2 to 11.8×109 cm-2. Strengthening calculations helped determine that strengthening dispersion and dislocation are the primarily contributors for improving the yield strength of tempered COST-FB2 steel. Grain boundary and block boundary strengthening are superimposed with the sum of matrix strengthening, dispersion strengthening and dislocation strengthening increments. In summary, the superimposed block boundary strengthening increment corresponded to the experimentally obtained yield strength. This study can help improve the overall heat treatment of large forging rotors and domesticate them.
Key words:  COST-FB2 steel    quenching temperature    microstructure and mechanical properties    strengthen mechanism
发布日期:  2022-07-26
ZTFLH:  TG156  
基金资助: 国家自然科学基金(51971226)
通讯作者:  yanggang@nercast.com   
作者简介:  殷会芳,钢铁研究总院博士研究生,主要从事耐热钢组织与性能的研究,并发表学术论文10余篇。
杨钢,钢铁研究总院教授,首席专家,博士研究生导师,享受国务院政府特殊津贴。1984年于浙江大学获学士学位,分别在1987年和1990年于钢铁研究总院获得工学硕士学位和工学博士学位,留院工作至今。主要从事不锈耐热钢的研发和应用工作。发表论文180余篇,获授权专利35项,著作1本,获国家科技进步一等奖1项。
引用本文:    
殷会芳, 赵吉庆, 杨钢. 淬火温度对超超临界火电站用COST-FB2钢显微组织和室温强度的影响[J]. 材料导报, 2022, 36(14): 21030261-6.
YIN Huifang, ZHAO Jiqing, YANG Gang. Effect of Quenching Temperature on Microstructures and Room Temperature Strength of COST-FB2 Steel Used in Ultra-supercritical Coal-fired Power Plants. Materials Reports, 2022, 36(14): 21030261-6.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.21030261  或          http://www.mater-rep.com/CN/Y2022/V36/I14/21030261
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