Processing of new dual-phase (DP) and complex-phase (CP) steels for automotive applications by tailored hot forming routes

Recent developments and perspectives of advanced high-strength medium Mn steel: from material design to failure mechanisms

“…Three generations of AHSS have been developed over the last four decades in order to meet the demands in the automotive industry (figure 1). The first generation AHSS was proposed in the 1980s, which includes interstitial-free steel [2], dual-phase (DP) steel [3][4][5], complex phase (CP) steel [6][7][8], martensitic (MART) steel [9][10][11], high strength low alloy (HSLA) steel [12][13][14] and conventional transformationinduced plasticity (TRIP) steel [15][16][17]. The microstructure of the first generation AHSS consists mainly of body-centered cubic (BCC) phases, such as ferrite, martensite or bainite, with a relatively small fraction (typically ⩽ 10%) of facecentered cubic (FCC) phase, i.e.…”

High Strain Rate Mechanical Behavior of Advanced High Strength Steels

“…Some of these steels have been applied in automotive industry with increasing proportion, as shown in Fig. Fe-0.18C-2.45Mn-1.03Si [19] Fe-(0.10~0.14)C-1.50Mn-1.48Si [20] Fe-0.20C-1.80Mn-2.00Si [21] CP F+M + RA + B Fe-0.14C-2.5Mn-0.14Si [22] Fe-(~0.15)C-(1.50~2.5)Mn-(<0.50)Si-(<0.70)Cr [23] F + M + B Fe-0.11C-2.85Mn-0.10Si [24] M + RA + B Fe-0.15C-2.2Mn-0.05Si [25] MART M Fe-0.03C-0.3Mn [26] M + carbide Fe-0.3C-1.00Mn-0.29Si-0.50Cr-0.02Nb [27] The starting point of developing the first generation AHSSs was to meet the requirement of having better strength and ductility but just at slightly higher cost than conventional high strength steels, to deal with the increasing fuel crisis and greenhouse gases emission problem. The first member of AHSSs family is DP steel, even though the 1.1.1 First generation AHSSs -5 -concept of AHSS did not exist when DP steel appeared in 1980s [5].…”

“…1. 25 The engineering stress-strain curves of (a) DP 600 and (b) DP 800 steel under dynamic and static tensile tests [187].…”

“…3 Microstructure characterization and fracture surface analysis [16,19,[91][92][93][94][95][96][97], TRIP steel [19][20][21][96][97][98][99][100][101][102][103][104], CP steel [22][23][24][25]97,[105][106][107][108], MART steel [23,91,96,97,[109][110][111][112], TWIP steel [37][38][39]46,47,96,[113][114][115][116], AUST. SS [117][118]…”

“…......................................................................................... 16 Fig. 1.13 Tensile mechanical properties of various AHSSs from existing literature: DP steel[16,19,[91][92][93][94][95][96][97], TRIP steel[19][20][21][96][97][98][99][100][101][102][103][104], CP steel[22][23][24][25]97,[105][106][107][108], MART steel[23,91,96,97,[109][110][111][112], TWIP steel[37][38][39]46,47,96,[113][114][115][116], AUST. SS…”