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the temperature at which austenite begins to form during heating (compare: transformation tempetaure Ac3), temperatuur, mil austeniit hakkab tekkima kuumutamisel (vrd faasimuutustemperatuur Ac3)
transformation temperature Ac1 . Materjalitehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mtr/transformation%20temperature%20Ac1/1/eng (27.07.2026)