13th International Conference on Fracture June 16–21, 2013, Beijing, China -2- C Si Mn P S Cr W Mo Co Ni V Nb N O B Sol.Al MARBN10 0.078 0.29 0.54 0.003 0.001 9.11 3.13 <0.01 3.03 <0.01 0.21 0.052 0.0030 0.003 0.010 0.001 MARBN12 0.081 0.30 0.53 0.001 0.001 9.09 2.62 <0.01 3.02 <0.01 0.21 0.052 0.0072 0.003 0.011 0.001 MARBN10 steel MARBN12 steel Alloy 617 Alloy 263 Inconel 82 welding using the filler wire of Inconel 82 as shown in Fig. 1. The groove configuration of these welds was U with 20 ˚ of groove angle. After welding, all the weld joints were given post weld heat treatment (PWHT) at 740 ˚C for 4 h. Weld defects were not detected in the radiographic examination and magnetic particle testing. The distribution of micro Vickers hardness of the MARBN10 steel-Alloy 263 weld after PWHT and before creep condition is shown in Fig. 2. Creep tests of the base metals were conducted using round bar-type specimens 6 mm in diameter and 30 mm in gauge length. Creep tests of the dissimilar weld joints were conducted at 650 ˚C using the smooth plate-type specimens 17.5 × 5 mm in section and 100 mm in gauge length as shown in Fig. 3. Table 1. Chemical compositions of the present high B-9Cr steels (wt. %) Figure 1. Dissimilar welds used in the present study Figure 2. Hardness distribution in the present dissimilar weld joint (MARBN10 steel-Alloy 263 weld) after PWHT and before creep
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