Influence of temperature history on strain‐induced austenite transformation in 304 stainless steel

Experimental investigations were undertaken to find temperature history effects on strain‐induced austenite transformation in metastable 304 stainless steel. Interrupted static tension tests were performed at temperatures 0 and — 15°C. During the first stage of deformation specimens were deformed at temperature T 1 . During the second stage temperature T 2 was applied. Cases T 1 > T 2 and T 1 < T 2 were examined. Final amounts of α’ martensite X M were measured magnetically. A method for their summation of martensite amounts was sought for and a conclusion was obtained showing that the final amount of martensite can be calculated by the relationship X M = f(ε)| T 2 where ε = ε T 1 , + ε T 2 ±Δε. The corrective strain Δε depends on ε T 1 . Its connection with true stress – true plastic strain curve at temperature T 1 is discussed in this investigation.