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- 저자 : G.R. Jinu (검색결과 2 건)
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Comparison of thermal fatigue behaviour of ASTM A 213 grade T-92 base and weld tubes
G. R. Jinu,P. Sathiya,G. Ravichandran,A. Rathinam 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.5
Super-heater tubes are subjected to alternate heating and cooling in power plants causing them to crack and eventually fail. This phenomenon is referred to as “thermal fatigue.” In this paper, a laboratory simulation for reproducing the thermal fatigue phenomenon is developed to determine the number of cycles necessary before failure occurs in super-heater tubes. The temperature and strain distributions along the specimen were computed theoretically using ANSYS software for the applied temperature condition. The thermal fatigue test was conducted for both base and shielded metal arc (SMA) welded tubes separately and both passed in the non-destructive tests. These tubes were subjected to thermal cycles from 800ºC (accelerated temperature) to room temperature. Oxy-acetylene heating setup was utilized as a heating source, and a water bath was utilized for quenching purposes. The tests were carried out until open cracks were identified. Surface cracks were identified in the base and weld tubes after 90 and 60 cycles respectively. This study reveals that heating and cooling cause thermal fatigue, initiate cracks in the tubes.
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M. Manoj,G.R. Jinu,T. Muthuramalingam,R. Leo Bright Singh 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.4
The ceramic particles reinforced with aluminium metal matrix composites(AMMCs) has found its usage in variousapplications due to its distinct performance parameters. In the present study, an effort was made to synthesize and analysethe mechanical characteristics of TiB2 reinforced Al7075 metal matrix composites (MMCs) using stir casting technique byvarying the weight percentage of TiB2. The micro Vickers hardness, tensile strength, flexural properties are considered as theperformance measures in the present investigation. It was found that the addition of TiB2 could enhance the mechanicalcharacteristics of the MMCs significantly. The enhancement in hardness of the MMCs is due to the amalgamation of rigorousreinforcement in the matrix. The TiB2 reinforcement in the matrix alloy was found to increase the tensile and flexural strengthof AMMCs considerably. The TiB2 particles are consistently disseminated in aluminium matrix alloy with considerablebonding strength.
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