Surface heterostructuring in laser-treated alloys through local austenitization for high strength and formability

Figures & data

Figure 1. (a) Schematics showing the procedure of the proposed strategy for local austenitization aimed at enhancing forming. (b) Distribution of equivalent plastic strain in the bending simulation to select the region for local austenitization.

Please change fig. #1 with attached file (Proof_Fig. 1).

Table 1. Processing conditions for laser treatment.

Samples	Laser Power	Scan speed	Hatch spacing	Shield gas
RA60	60 W	14 mm/s	0.3 mm	8 L/min
RA75	75 W	14 mm/s	0.3 mm	8 L/min

Figure 2. Simulation results for thermal analysis showing (a) temperature distribution during laser treatment and (b) peak temperature along the distance from the surface. (c) XRD patterns for the present samples. The magnified patterns correspond to the 2θ angles ranging from 40° to 55°.

Please change fig. #2 with attached file (Proof_Fig. 2).

Figure 3. EBSD maps including (a, e) inverse pole figure, (b, f) image quality, (c, g) phase, (d, h) GND density for the (a-d) RA60 and the (e-h) RA75 samples.

Figure 4. (a) Engineering strain-stress curves and (b) load-displacement curve of the bending test. (c) Images of the samples following the bending test. (d) A bar chart showing the comparison of elongation and bending limit among the present samples.

Figure 5. (a) OM images of the bent samples of (a) As-rolled, (b) RA60, and (c) RA75 samples. The insert in (b, c) is the magnified image of the micro crack. Schematics for the samples with local austenitization in (d) tensile testing and (e) bending forming.