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The effect of boron and nitrogen on the microstructure evolution in heat affected zone (HAZ) of 9Cr steel during simulated heating and on the Type IV fracture in welded joints has been investigated at 650°C. Gr.92 exhibits a significant decrease in time to rupture after thermal cycle to a peak temperature near A C3 , while the creep life of Gr.92N, subjected to only normalizing but no tempering,...
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