217 Influence of Geometry of the Gun Nozzle and the Entrance Convergent Section Length on Properties of Cold Sprayed Copper Coatings (original) (raw)
2007, The Proceedings of the Materials and processing conference
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Creep Property Assessment of 9Cr Steel Boiler Piping by Small Punch Test
Journal of the Society of Materials Science, Japan, 2021
The small punch (SP) creep testing technique was applied to five heats of Gr.91 steel, which had been actually used for boiler pipings in the different USC power plants for long periods of time. As a result, it was found that the difference in creep strength between the heats, that is, the heat-to-heat variation, was well reflected in the SP creep property. In addition, the conventional SP test was carried out at room temperature and 650°C to obtain the load/stress conversion coefficient (F/σ) which is necessary for the conversion of SP creep rupture data to the uniaxial ones. The F/σ for each heat was estimated by the displacement to maximum load (um) using the correlation of F/σ = um h0/0.320. The experimental results revealed that the F/σ showed no significant change and it was 2.4-2.5 irrespective of heats. It was also found that the SP creep rupture data were relatively well converted to the uniaxial one with those coefficients.
Transactions of the Japan Society of Mechanical Engineers Series B, 2010
Creep tests 〔 ♪n g Cr and l2 Cr steels welded joints were conducted under interna1 pressure conditions as well as uniaxial stress conditions ． For both materials ， failurc occurs at Iinc graln HAZ region under Iung tilne region ， wh ｛ ch means type IV damage． SEM observation was carried out oll internal pressure test specimens of thc wclded l oints ， It was found that density Qf creep veids is higher 正 n mid − thickness of the HAZ portion than that in outer and inner surfaces ． Furthermore ， a recently developed demonstration test facility ， which can Ioad bending forces and jnterna 且 pressure oll actual boiler pipes at high temperatures ， is bric 〔 ly introduced ill this presentation ． Key Vo rds
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