Effect of Dendrite Orientation on SCC of Weld Metal of Nickel-Based Alloy Inconel 182 in PWR Primary Water
The effect of dendrite orientation on stress corrosion cracking(SCC)behavior of weld metal of nickel-based alloy Inconel 182 in simulated pressurized water reactor(PWR)high-temperature primary water was investigated by SCC test.The result show that an extensive interdendritic stress corrosion crack growth zone appeared on the fracture surface of the LT-oriented 182 alloy specimen in the simulated PWR primary water at 320 ℃.Both the average crack growth rate and the maximum crack growth rate of the LT-oriented 182 alloy specimen at 320 ℃ were higher than those of the same sample at 290℃,indicating that the stress corrosion crack growth of 182 alloy weld metal was promoted by increasing temperature in the simulated PWR primary water.At 290 ℃,the average crack growth rate,maximum crack growth rate and crack growth zone width ratio of the LT-oriented specimen were greater than those of the TL-oriented specimen,which indicated that cracks were easier to expand along the LT dendrite orientation.
nuclear power plantnickel-based alloy 182stress corrosion crackingdendrite orientationcrack growth rate
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