The fourth-generation nuclear energy systems is a better security, economic competitiveness, nuclear waste, less advanced nuclear energy systems can be effective in preventing nuclear proliferation, represents the development trend of advanced nuclear energy systems and the cutting edge of technology.

In view of the extreme working conditions of the fourth-generation nuclear energy systems, material selection is very important. As fourth-generation nuclear energy systems heat exchanger alternative materials Ni-base alloy 230 is a solid solution strengthening of austenitic high-temperature alloy, alloy with excellent high temperature strength, high antioxidant capacity, and the excellent metallurgical stability and long-term thermal exposure and the ability of grain coarsening resistance and low coefficient of thermal expansion. Alloys in a very short holding time for the temperature range of 600 ~ 800 ℃ under creep-fatigue properties are rarely reported, Las Vegas University of Nevada, the researchers study.

Nickel-base alloy 230 chemical composition: C0.11, Mn0.50, Fe0.42, Si0.39, Cr22.01, Ni60.76, Al0.40, Co0.10, Mo1.25, W14.06. The researchers used compaction under the atmosphere - tensile specimens, 600, 700 and 800 ° C, holding time from 60 ~ 1000s,the stress intensity factor range constant controlled trial study of 230 alloy crack growth characteristics. The results are as follows:

High temperature cracking speed is very significant cracking at 800 ° C under full time.

The optical micrograph shows a large number of precipitates along the grain boundary, leading to inter granular cracking, even in the 800 ° C, the degree of cracking in the 120sa very short

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