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the temperature at which transformation of ferrite to austenite is completed during heating (compare: transformation temperature Ac1), temperatuur, mil leiab aset ferriidi muutumine austeniidiks kuumutamisel (vrd faasimuutustemperatuur Ac1)
faasimuutustemperatuur Ac3 . Materjalitehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mtr/faasimuutustemperatuur%20Ac3/1/est (13.07.2026)