基于EBSD技术的P91钢蠕变过程中小角度晶界演化行为表征

doi:10.11896/j.issn.1005-023X.2018.10.033

Abstract
Figure/Table
References
Related Citation (15)

Download:

Full Text ( PDF ) (2316KB)
Export: BibTeX | EndNote (RIS)

Abstract The high-temperature creep and interrupted creep tests of P91 steel were carried out under the stress of 145 MPa at 620 ℃. The evolution of small-angle grain boundary during creep was investigated by electron backscatter diffraction (EBSD) technique. Meanwhile, the misorientation distribution in the EBSD image was introduced to characterize the dislocation density of small-angle grain boundary with the misorientation of adjacent grains from 0.5° to 5°. By these methods, the relationships between the boundary dislocation density, the number of small-angle grain boundaries, plastic strain, and internal microstructure evolution were discussed during creep. Besides, the influence of calculation step size on the boundary dislocation density was analyzed in detail. The results manifested that the dislocation density at the small-angle boundaries increased rapidly from the primary creep to the beginning of the secondary creep. Then, it reached a peak when the creep rate was minimum. Afterwards, it decreased slowly and then remained constant until the creep rupture. Moreover, it indicated that the smaller the step size of EBSD, the more accurate the dislocation density value can be obtained.

Key words： P91 steel creep electron backscatter diffraction small-grain boundary dislocation density

Published: 25 May 2018 Online: 2018-07-06

CLC number:

TG144

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	GUO Miaomiao
	LIU Xinbao
	ZHU Lin
	ZHANG Qi
	LIU Jianqiu

Cite this article:

GUO Miaomiao,LIU Xinbao,ZHU Lin, et al. Characterization of Small-angle Grain Boundary Evolution During Creep of P91 Steel Using EBSD Technique[J]. Materials Reports, 2018, 32(10): 1747-1751.

URL:

https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.10.033 OR https://www.mater-rep.com/EN/Y2018/V32/I10/1747

1 Zhao J, Li D M, Fang Y Y. Statistical analysis and reliability prediction of creep rupture property for T91/P91 steel[J]. Acta Metallurgica Sinica,2009,45(7):835(in Chinese).
赵杰,李东明,方园园.T91/P91钢持久性能的统计分析和可靠性预测[J].金属学报,2009,45(7):835.
2 Zhao C L, Liu X B, Hao Q E, et al. Progress in prediction methods of creep-rupture time for elevated-temperature metal components[J]. Materials Review A: Review Papers,2014,28(12):55(in Chinese).
赵彩丽,刘新宝,郝巧娥,等.高温金属构件蠕变寿命预测的研究进展[J].材料导报:综述篇,2014,28(12):55.
3 Gao Y J, Huang L L, Luo Z R, et al. Phase field crystal simulation dislocation movement and reaction[J]. Acta Metallurgica Sinica,2014,50(1):110(in Chinese).
高英俊,黄礼琳,罗志荣,等.晶界位错运动与位错反应过程的晶体相场模拟[J].金属学报,2014,50(1):110.
4 Lu C J, Jiang L T, Wang Y L, et al. Simulating structure of dislocation and its evolution in low angle grain boundary by phase field crystal method[J]. Guangxi Sciences,2013,20(4):316(in Chinese).
卢成健,蒋丽婷,王玉玲,等.晶体相场法模拟小角度晶界的位错结构及其演化[J].广西科学,2013,20(4):316.
5 He W, Ma W, Pantleon W. Microstructure of individual grains in cold-rolled aluminium from orientation inhomogeneties resolved by electron backscattering diffraction[J]. Materials Science & Enginee-ring: A,2008,494:21.
6 Berecz T, Jenei P, Csore A, et al. Determination of dislocation density by electron backscatter diffraction and X-ray line profile analysis in ferrous lath martensite[J]. Materials Characterization,2016,113:117.
7 Li F, Huang H B. Development and application of the function of electron backscattered diffraction analysis[J]. Research and Exploration in Laboratory,2011,30(11):217(in Chinese).
李凡,黄海波.电子背散射衍射分析功能的开发及其应用[J].实验室研究与探索,2011,30(11):217.
8 Morawiec A. Orientations and rotations[M]. Berlin: Springer-Verlag,2004:1.
9 Pantleon W. Resolving the geometrically necessary dislocation content by conventional electron backscattering diffraction[J]. Scripta Materialia,2008,58:994.
10 Kostka A, Tak K, Hellmig R, et al. On the contribution of carbides and micrograin boundaries to the creep strength of tempered martensite ferritic steels[J]. Acta Materialia,2007, 55(2):539.
11 Zhong W L, Li W S, Wang W, et al. Microstructure and mechanical properties of P91 steel pipe after long term service[J]. Heat Treatment of Metals,2015,40(6):54(in Chinese).
钟万里,李文胜,王伟,等.P91钢管长时间服役后的组织与力学性能[J].金属热处理,2015,40(6):54.
12 Zhang B, Hu Z F, Wang Q J, et al. Creep rupture micromechanism of domestic T91 heat resistant steel at 650 ℃[J]. Heat Treatment of Metals,2010,35(9):41(in Chinese).
张斌,胡正飞,王起江,等.国产T91耐热钢650 ℃蠕变断裂微观机理[J].金属热处理,2010,35(9):41.
13 Taylor A S, Hodgson P D. Dynamic behavior of 304 stainless steel during high Z deformation[J]. Materials Science & Engineering: A,2011,528(9):3310.
14 Pesicka J, Dronhofer A, Eggeler G. Free dislocations and boundary dislocations in tempered martensite ferritic steels[J]. Materials Science & Engineering: A,2008,387:176.
15 冯端.金属物理学[M].北京:科学出版社,1999:52.
16 Sauzay M. Modelling of the evolution of micro-grain misorientation during creep of tempered martensite ferritic steels[J]. Materials Science and Engineering: A,2009,510: 74.
17 Sklenicka V, Kucharova K, Svoboda M, et al. Long-term creep behavior of 9%—12% Cr power plant steels[J]. Materials Characterization,2003,51:35.
18 Pesicka J, Kuzel R, Dronhofer A, et al. The evolution of dislocation density during heat treatment and creep of tempered martensite ferritic steels[J]. Acta Materialia,2003,51:4847.
19 Morito S, Nishikawa J, Maki T. Dislocation density within lath martensite in Fe-C and Fe-Ni alloys[J]. ISIJ International,2003,43(9):1475.
20 Sandvik B P J, Wayman M. Characteristics of lath martensite: Part Ⅱ. The martensite-austenite interface[J]. Metallurgical Transactions:A,1983,14:823.