(9~12)%Cr马氏体耐热钢中微量B元素的择优分布行为及其对微观组织与力学性能的影响
Preferential Distribution of Boron and its Effect on Microstructure and Mechanical Properties of (9~12)%Cr Martensitic Heat Resistant Steels
查看参考文献69篇
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文摘
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(9~12)%Cr钢中添加微量B元素可显著抑制M_(23)C_6碳化物的熟化,从而提高蠕变强度,增加蠕变断裂寿命。钢中B元素的择优分布行为是其充分发挥积极作用的关键,也是深入研究其作用机理的前提,一直是(9~ 12)%Cr马氏体耐热钢领域的研究热点。本文简述了B元素对钢力学性能的影响,介绍了表征钢中微量B元素分布的常用实验手段。在阐述B元素在钢中的物理冶金学原理以及固溶与扩散机制的基础上,重点讨论了B元素在(9~12)%Cr马氏体耐热钢中的择优分布行为及其影响因素。最后对目前微量B元素抑制马氏体耐热钢中M_(23)C_6碳化物熟化的2种机理进行了梳理,系统地阐述了B元素的择优分布行为与其抑制M_(23)C_6碳化物熟化、提高蠕变性能的积极作用之间的关系,深化对B元素在(9~12)%Cr马氏体耐热钢中的作用机理的认识。 |
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其他语种文摘
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Addition of small amount of boron (B) in the (9~12)%Cr martensitic heat resistant steels can obviously prohibit the Ostwald ripening of M_(23)C_6 carbides so as to improve creep strength as well as creep rupture life. With the purpose of taking full advantages of B element, it is critical to make B preferentially distribute in (9~12)%Cr martensitic heat resistant steels. The mechanism of B preventing M_(23)C_6 carbides from ripening is also on the premise of clearly identifying the preferential distribution of B in the steels. Much concern has been growing over the preferential distribution of B in the research of (9~ 12)%Cr martensitic heat resistant steels. Therefore, this article gives a review on this aspect. Following a summary of the effect of B on mechanical properties, several commonly used characterizing methods for B segregation in the steels are introduced. Based on the physical metallurgy and the solution, diffusion mechanisms of B element, discussions on the preferential distribution of B element at prior austenite grain boundaries and in the M_(23)C_6 carbides as well as the related factors are emphasized. At last, two prevalent mechanisms of B restraining the coarsening of M_(23)C_6 carbides in (9~12)%Cr martensitic heat resistant steels are given by an intensive explanation so that the relationship between the preferential distribution of B and its advantage of increasing creep performance by suppressing the ripening M_(23)C_6 carbides are systematically elaborated, which gives a deep understanding of the role of B element in (9~ 12)%Cr martensitic heat resistant steels. |
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来源
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金属学报
,2020,56(1):53-65 【核心库】
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DOI
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10.11900/0412.1961.2019.00146
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关键词
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马氏体耐热钢
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B
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偏聚
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M_(23)C_6碳化物
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Ostwald熟化
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地址
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1.
中国科学院金属研究所, 沈阳, 110016
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中国科学技术大学材料科学与工程学院, 沈阳, 110016
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中国科学院金属研究所, 中国科学院核用材料与安全评价重点实验室, 沈阳, 110016
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语种
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中文 |
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文献类型
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综述型 |
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ISSN
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0412-1961 |
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学科
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金属学与金属工艺 |
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基金
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国家重点研发计划项目
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国家自然科学基金项目
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文献收藏号
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CSCD:6651011
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