10Cr耐热钢高温蠕变过程中的组织演变研究

J. Mater. Sci. Technol. ›› 2011, Vol. 27 ›› Issue (4): 344-351.

10Cr耐热钢高温蠕变过程中的组织演变研究

胡平¹,²,严伟³,Wei Sha（沙维）⁴,⁵,王伟⁶,单以银⁷,杨柯¹

1. 中国科学院金属研究所
2. 中国科学院研究生院
3. 沈阳中科院金属研究所
4.
5. Queen's University Belfast
6. 广东电网公司电力科学研究院
7. 中科院金属所

收稿日期:2010-09-06 修回日期:2011-01-08 出版日期:2011-04-28 发布日期:2011-04-28
通讯作者: 严伟
基金资助:
超（超超）临界火电机组蒸汽管道用耐热钢的研究;高性能钢的组织调控理论与技术基础研究

Microstructure Evolution of a 10Cr Heat-Resistant Steel during High Temperature Creep

Ping Hu, Wei Yan, Wei Sha, Wei Wang, Yiyin Shan, Ke Yang

1) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2) Graduate School of Chinese Academy of Sciences, Beijing 100049, China
3) School of Planning, Architecture and Civil Engineering, Queen0s University of Belfast, Belfast BT7 1NN, UK
4) Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhou 510080, China

Received:2010-09-06 Revised:2011-01-08 Online:2011-04-28 Published:2011-04-28
Supported by:
the National 863 HighTech Project (No. 2006AA03Z530) and the National 973 Program (No. 2010CB630800)

摘要/Abstract

摘要： 本文对一种新设计的10Cr铁素体/马氏体耐热钢在600℃蠕变过程中的组织演变规律进行了研究。蠕变实验显示600℃下相比ASME-P92钢新设计的10Cr钢具有更高的持久强度。利用透射电子显微镜、扫描电子显微镜和电子探针等表征技术对蠕变后的组织演变进行了观察和分析。结果表明，蠕变发生后初始组织中的马氏体板条随时间逐渐粗化，且观察到在经过约8354h的长时蠕变后马氏体板条最终还会碎化成亚晶结构。新的第二相即Laves相在蠕变过程中析出和长大并不断向原奥氏体晶界聚集，因而引起了材料内部固溶强化和析出强化作用的交互变化并表现为使双对数坐标系中蠕变断裂强度-断裂时间曲线发生两次明显的斜率改变。另外，蠕变断裂试样发生蠕变的部分的硬度随时间下降的速率和幅度均较发生时效的部分的更快则证明应力在蠕变过程中会起到加速组织演变的作用。

Abstract: The microstructure evolution of a 10Cr ferritic/martensitic heat-resistant steel during creep at 600°C was investigated in this work. Creep tests demonstrated that the 10Cr steel had higher creep strength than conventional ASME-P92 steel at 600°C. The microstructure after creep was studied by transmission electron microscopy, scanning electron microscopy and electron probe microanalysis. It was revealed that the martensitic laths were coarsened with time and eventually developed into subgrains after 8354 h. Laves phase was observed to grow and cluster along the prior austenite grain boundaries during creep and caused the fluctuation of solution and precipitation strengthening effects, which was responsible for the two slope changes on the creep rupture strength vs rupture time curve. It was also revealed that the microstructure evolution could be accelerated by stress, which resulted in the lower hardness in the deformed part of the creep specimen, compared with the aging part.

Key words: Ferrous metals and alloys, Creep, Microstructure

胡平严伟 Wei Sha（沙维）王伟单以银杨柯. 10Cr耐热钢高温蠕变过程中的组织演变研究[J]. J. Mater. Sci. Technol., 2011, 27(4): 344-351.

Ping Hu, Wei Yan, Wei Sha, Wei Wang, Yiyin Shan, Ke Yang. Microstructure Evolution of a 10Cr Heat-Resistant Steel during High Temperature Creep[J]. J Mater Sci Technol, 2011, 27(4): 344-351.

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