T. Shinya et Y. Tomita, EFFECT OF CALCIUM TREATMENTS AND STRAIN-RATE ON REHEAT CRACKING OF VANADIUM-MODIFIED 2.25CR-1MO STEEL, Materials characterization, 40(4-5), 1998, pp. 221-225
Vanadium-modified (V-Mod) 2.25Cr-1Mo steel has been studied to determi
ne the effect of calcium treatments and strain rate on susceptibility
to reheat cracking of the heat-affected zone in low-alloy steels for r
eactor applications. The susceptibility to reheat cracking was determi
ned by tensile tests in the strain-rate range of 1 x 10(-4)/s to 3 x 1
0(-6)/s in the temperature region of 293K to 1023K. The grain size of
tensile specimens was about 200 mu m. For the low-sulfur V-Mod steel,
calcium treatment dramatically increased the total elongation and redu
ction of area at 923K at high strain rates. However, the beneficial ef
fect on the ductility decreased as the strain rate decreased. For the
V-Mod steel with commercial sulfur-content level, the addition of calc
ium was not very effective in decreasing the susceptibility to reheat
cracking, independent of the strain rates investigated The results are
described and discussed. (C) Elsevier Science Inc., 1998.