Academic literature on the topic 'Modified 9Cr-1Mo steel'

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Journal articles on the topic "Modified 9Cr-1Mo steel"

1

Bertrand, C., A. Allou, F. Beauchamp, E. Pluyette, P. Defrasne, and F. Baqué. "Thermomechanical Model and Bursting Tests to Evaluate the Risk of Swelling and Bursting of Modified 9Cr-1Mo Steel Steam Generator Tubes during a Sodium-Water Reaction Accident." Science and Technology of Nuclear Installations 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/974581.

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The MECTUB code was developed to evaluate the risk of swelling and bursting of Steam Generator (SG) tubes. This code deals with the physic of intermediate steam-water leaks into sodium which induce a Sodium-Water Reaction (SWR). It is based on a one-dimensional calculation to describe the thermomechanical behavior of tubes under a high internal pressure and a fast external overheating. The mechanical model of MECTUB is strongly correlated with the kind of the material of the SG tubes. It has been developed and validated by using experiments performed on the alloy 800. A change to tubes made of Modified 9Cr-1Mo steel requires more knowledge of Modified 9Cr-1Mo steel behavior which influences the bursting time at high temperatures (up to 1200°C). Studies have been initiated to adapt the mechanical model and to qualify it for this material. The first part of this paper focuses on the mechanical law modelling (elasticity, plasticity, and creep) for Modified 9Cr-1Mo steel and on overheating thermal data. In a second part, the results of bursting tests performed on Modified 9Cr-1Mo tubes in the SQUAT facility of CEA are used to validate the mechanical model of MECTUB for the Modified 9Cr-1Mo material.
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2

Sivabharathy, M., P. Palanichamy, M. Vasudevan, P. Kalyanasundaram, and K. Ramachandran. "An Experimental Study of the Thermal Properties of Modified 9Cr-1Mo Steel." Defect and Diffusion Forum 332 (December 2012): 1–6. http://dx.doi.org/10.4028/www.scientific.net/ddf.332.1.

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In this paper, the application of the photo-acoustic method to study the thermal properties of modified 9Cr-1Mo Steel is described. The photo-acoustic measurements are carried out for the thermal properties of modified 9Cr-1Mo steel samples of various thicknesses. The theoretical basis for quantitative measurements is discussed, together with the advantages and limitations of these methods as compared with conventional measurements.
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3

Jones, Wendell B., C. R. Hills, and D. H. Polonis. "Microstructural evolution of modified 9Cr-1Mo steel." Metallurgical Transactions A 22, no. 5 (1991): 1049–58. http://dx.doi.org/10.1007/bf02661098.

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4

Hyun, Yang Ki, Soon Ho Won, Jae Ho Jang, and In Bae Kim. "The Evaluation of Material Degradation in Modified 9Cr-1Mo Steel by Electrochemical and Magnetic Property Analysis." Key Engineering Materials 321-323 (October 2006): 486–91. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.486.

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Evolution of microstructure due to service exposure to high temperature has a strong effect performance of heat resistant steels. In case of modified 9Cr-1Mo steels, precipitation of Fe2Mo-type laves phases and coarsening of M23C6-type carbides are the primary cause of degradation of mechanical properties such as creep resistance, tensile strength and toughness. Therefore creep tests have been carried out on modified 9Cr-1Mo steels to examine the effect of aging and stress on the creep strength. Additionally vibrating sample magnetometer is used to measure hysteresis loop.
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5

Li, Sheng Zhi, Jie Xu, Yuan De Yin, J. G. Xue, and Y. Feng. "The Study of Inner Surface Crack Formation of Seamless Modified 9Cr-1Mo Tube Rolled on Mandrel Mill and Its Application." Materials Science Forum 561-565 (October 2007): 61–64. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.61.

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The hot workability of modified 9Cr-1Mo, as a grade of heat resistant steels, is inferior to that of low-alloy steel, so the inner surface crack (ISC) easily occurs in seamless boiler tubes produced by the Mandrel Mill under improper rolling conditions. With the aid of FEM, the metal flow status during the rolling process was analyzed in 140mm 8-stand mandrel mill of Bao Steel. Both the metallographic shape and size of the ISC together with the result from the simulation show that the ISC of seamless tube forms at the elongation stage of shell. The mechanism of the ISC was discussed. With its initiation in stand No.1 and No.2 due to poor hot workability of modified 9Cr-1Mo steel, the ISC develops in subsequent passes. Based upon the mechanism devised was a special roll pass system which substantially upgraded the yield of qualified products.
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6

Park, Jong Seo, Un Bong Baek, Seung Hoon Nahm, Sang In Han, and Song Chun Choi. "The Application of Nondestructive Methods for Degradation Evaluation of Modified 9Cr-1Mo Steel." Key Engineering Materials 321-323 (October 2006): 528–31. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.528.

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The nondestructive evaluation technique for the material degradation is necessary because of the limitation of conventional destructive methods. In this study, an ultrasonic velocity measurement method was attempted for the estimation of the creep damage of degraded modified 9Cr-1Mo steel. The specimens with seven different kinds of aging periods were prepared by an isothermal heat treatment at 690 . The ultrasonic velocity was measured by an immersion method. The correlation between the measured ultrasonic velocity and tensile properties were studied. The ultrasonic velocity has an declining tendency with the increase of heat treatment time. A correlation between the ultrasonic velocity and aging parameter were established, which allows one to estimate the material degradation of modified 9Cr-1Mo steel.
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7

Nakashima, Hideharu, Daisuke Terada, Fuyuki Yoshida, Hiroyuki Hayakawa, and Hiroshi Abe. "EBSP analysis of Modified 9Cr-1Mo Martensitic steel." ISIJ International 41, Suppl (2001): S97—S100. http://dx.doi.org/10.2355/isijinternational.41.suppl_s97.

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8

Choudhary, B. K., and E. Isaac Samuel. "Creep behaviour of modified 9Cr–1Mo ferritic steel." Journal of Nuclear Materials 412, no. 1 (2011): 82–89. http://dx.doi.org/10.1016/j.jnucmat.2011.02.024.

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9

Shrestha, Triratna, Mehdi Basirat, Indrajit Charit, Gabriel P. Potirniche, Karl K. Rink, and Uttara Sahaym. "Creep deformation mechanisms in modified 9Cr–1Mo steel." Journal of Nuclear Materials 423, no. 1-3 (2012): 110–19. http://dx.doi.org/10.1016/j.jnucmat.2012.01.005.

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10

Kim, Sung Ho, Ji-Hyun Yoon, Woo Seog Ryu, Chan Bock Lee, and Jun Hwa Hong. "Fracture toughness of irradiated modified 9Cr–1Mo steel." Journal of Nuclear Materials 386-388 (April 2009): 387–89. http://dx.doi.org/10.1016/j.jnucmat.2008.12.324.

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