Serrated Flow and Dynamic Precipitation in Elevated Temperature Tensile Deformation of Fe–Mn–Al–C Alloys

Overview of Dynamic Strain Aging and Associated Phenomena in Fe–Mn–C Austenitic Steels

“…1 also shows serrations above 273 K. Although the serrations in Fig. 1 are attributed to DSA, serrations in FCC alloys can be caused by other metallurgical factors such as deformation twinning, 17) dynamic precipitation, 3,18) and martensitic transformation. [19][20][21] Therefore, we must carefully check deformation microstructure characteristics and temperature dependence of stress-strain response when serrations are correlated with DSA.…”

Relationship between Microstructures and Tensile Properties of an Fe-30Mn-8.5Al-2.0C Alloy

“…19) Obviously, the values of both strength and ductility are much lower than those obtained in the present study, and even lower than those obtained in the austenitic FeMnAlC (C 5 1:3%) alloys. [4][5][6][7][8][9][10][11][12][13][14] Therefore, it is reasonable to deduce that the þ 0 structure is thought to be more favorable for both strength and ductility than the o þ lamellar structure.…”

“…Depending on the chemical composition, the alloys in the as-quenched condition show various UTS ranging from 814 to 993 MPa, YS ranging from 423 to 552 MPa and elongation from 72 to 50%. [4][5][6][7][8][9]21) By the optimal aging treatments between 773 and 873 K for moderate times, a high density of fine 0 carbides started to precipitate coherently within the matrix and no precipitates were formed on the grain boundaries. The resulting microstructure could lead to the optimal combination of the mechanical strength and ductility.…”

“…According to the previous studies in the Fe-(26$34)%Mn-(7$11)%Al-(0:54$1:3)%C-(0$1:75)%(Nb+ V+Mo+W) alloys, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][21][22][23][24][25] it is seen that the as-quenched microstructure was single phase or phase with (Nb,V)C carbides. Depending on the chemical composition, the alloys in the as-quenched condition show various UTS ranging from 814 to 993 MPa, YS ranging from 423 to 552 MPa and elongation from 72 to 50%.…”

“…In their studies, it is seen that when an alloy with a chemical composition in the range of Fe-(26$34)%Mn-(7$11)%Al-(0:54$1:3)%C was solution heat-treated and then quenched, the microstructure of the alloy was single-phase austenite (). [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] When the as-quenched alloy was aged at temperatures ranging from 773 to 873 K for moderate times, fine (Fe,Mn) 3 AlC carbides started to precipitate coherently within the matrix, and no precipitates were found on the = grain boundaries. The resulting microstructure could possess a remarkable combination of strength and ductility.…”