Assessment of precipitates of isothermal aged austenitic stainless steel using measurement techniques of ultrasonic attenuation

다국어 초록 (Multilingual Abstract)

AISI 316L stainless steel is widely used as a structural material of high temperature thermoelectric power plants, since austeniticstainless steel has excellent mechanical properties. However, creep damage is generated in these components, which are operated under ahigh temperature and high pressure environment. Several researches have been done on how microstructural changes of precipitates affectto the macroscopic mechanical properties. And they investigate the relation between ultrasonic parameters and metallurgical results.
But, these studies are limited by experiment results only. In this paper, attenuations of ultrasonic with isothermal damaged AISI 316Lstainless steel were measured. Also, simulation of ultrasonic attenuation with variation of area fraction and size of precipitates were performed.
And, from the measured attenuations, metallographic data and simulation results, we investigate the relations between the ultrasonicattenuations and the material properties which is area fraction of precipitates for the isothermal damaged austenitic stainless steelspecimens. And, we studied parametric study for investigation of the relation between ultrasonic parameters and metallurgical results ofthe isothermal damaged AISI 316L stainless steel specimens using numerical methods.

참고문헌 (Reference)

1 S. Kenderian, "Ultrasonic monitoring of dislocations during fatigue of pearlitic rail steel" 358 (358): 90-99, 2003

2 H. Ogi, "Ultrasonic attenuation peak in steel and aluminum alloy during rotating bending fatigue" 31 (31): 1121-1128, 2000

3 J. W. Im, "Thermal aging and creep rupture behavior of STS316" 8 (8): 123-129,

4 K. Taguchi, "The influence of thermal ageing on the tensile and fatigue properties of advanced 316 steel for FBR structures" 221-225, 1996

5 B. Weiss, "Phase instabilities during high temperature exposure of 316 austenitic stainless steel" 3 (3): 851-866,

6 Y. Minami, "Microstructural changes in austenitic stainless steels during long-term aging" 2 : 795-806, 1986

7 I. Calliari, "Influence of isothermal aging on secondary phases precipitation and toughness of a duplex stainless steel SAF 2205" 41 (41): 7643-7649,

8 Masakazu Tane, "Elastic property of aged duplex stainless steel"

9 B. S. Im, "Effect of microstructural changes of precipitates on creep behavior of aged AISI 316L stainless steel" 2009

10 W. Yeih, "Detection of the corrosion damage in reinforced concrete members by ultrasonic testing" 28 (28): 1071-1083,

11 J. W. Im, "Creep-fatigue crack growth and creep rupture behavior in type 316stainless steels-effect of hold time and aging treatment" 1 (1): 71-77, 2000

12 T. Kang, "Characterization of fatigue damage of Al6061-T6 with ultrasound" 52 : 51-56,

13 M. Rosen, "An investigation of the precipitation-hardening process in aluminum alloy 2219 by means of sound wave velocity and ultrasonic attenuation" 1982