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http://dx.doi.org/10.3740/MRSK.2007.17.10.555

Effect of Cooling Rates on Mechanical Properties and Microstructure of Inconel Alloys  

Park, No-Kyeong (School of Materials Science and Engineering, Kyungpook National University)
Lee, Ho-Seong (School of Materials Science and Engineering, Kyungpook National University)
Chai, Young-Suck (School of Mechanical Engineering, Yeungnam University)
Publication Information
Korean Journal of Materials Research / v.17, no.10, 2007 , pp. 555-559 More about this Journal
Abstract
The mechanical properties and microstructure of Inconel 690 and 600 alloys with various cooling rates were investigated. Optical microscopy and scanning electron microscopy observations indicated that in case of the cooling rate of $0.5^{\circ}C/min$, discontinuous carbides along the grain boundaries were formed and when the cooling rate was $10^{\circ}C/min$, continuous carbides were formed in Inconel 690 and 600 alloys. For the annealed Inconel 690 alloy with high Cr content, a lot of annealing twins, which led the preferential growth of (111) planes, were observed. However, the annealed Inconel 600 alloy with low Cr content showed a few annealing twins and the preferential growth of (200) planes. Inconel 600 alloy had a larger value of ultimate tensile strength (UTS) than Inconel 690 alloy.
Keywords
Inconel alloy; Steam generator tube; Microstructure; Mechanical property; Heat treatment; Cooling rate;
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