1979 Volume 48 Issue 9 Pages 720-726
Relations between ductility of the weld heat-affected zones (HAZ) and postheating conditions were investigated by means of bead bend test concerning the specimens of 13Cr, 13Cr-Ni and 13Cr-Ni-Mo cast steels.
The results of these tests are summerized as follows.
1) In order to improve enough the ductility of the HAZ, it is necessary that the temperature of postheating is made above 600°C (below Ac1 point) and that the holding temperature before commence-ment of postheating is set lower than near the Mf point.
2) The ductility of the HAZ displays a strong tendency to depend upon the holding temperature. When the holding temperature is made higher than the vicinity of the Ms point, the ductility will not improve even with postheating at temperatures above 600°C.
3) In the range of suitable holding temperature, amount of martensite in the HAZ is approximately more than 80 percent.