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Inconel Grain Microstructure Stability

The resistance of the austenitic nickel-chromium matrix against undesired phase precipitations during long-term thermal exposure at elevated temperatures. This prevents component embrittlement during service.

Inconel is a nickel-based high-temperature material, not a classic austenite like steel. The statements about martensite or copper phases are simply wrong – the stuff has an austenitic matrix that remains stable even when cooling. The main problem when welding is the heat input: Too much heat causes grain growth and reduces strength. You have to keep the interpass temperature low and dose the heat properly, then you stay on the safe side.

MetallurgieSchweißtechnik

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