Table 1.

Chemical compositions of the three steels studied (wt.%).

Steel	Cu	C	Si	Cr	Ni	Mn	Mo	P	S	Fe
0Cu-steel	0.01	0.051	0.43	12.87	4.06	0.68	0.47	0.005	0.0041	Bal.
1Cu-steel	1.17	0.056	0.51	13.06	4.15	0.67	0.49	0.005	0.0047	Bal.
3Cu-steel	2.82	0.056	0.51	13.03	4.12	0.66	0.48	0.005	0.0050	Bal.