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J. Cao et aL/ Materials and Design 32(2011)2763-2770 6 06301 101 p13001 0 Fig 9. Inverse pole figure maps of (a) T92 CGHAZ, and(b) weld metaL Tensile test results of T92/S304H dissimilar materials joints. ple no Tensile strength(os MPa) T92 CGHAZ ASME S304H ing effect caused by grain boundary is weakest for its coarse den- dritic austenitic grain, orientation distribution of grains in weld metal zone, giving rise to higher strength than T92 CGHAZ in trans verse direction of the joints( Figs. 8 and 10). As a result, the fracture location is taken place at the t92CGHAZ finally Fig. 10. EBSD grain orientation map of weld metal near S304H HAZ side. 3. 2. 2. Impact toughness The impact test results of the joints are given in Fig. 12. It is than that in T92 base material, indicating that S304H base material clear that the average impact strength value of $304H base mate has higher strength than T92 base material [21]. Likewise, as the rial is the highest. In contrast, the average impact strength value average grain size of S304H HAz is similar to that of T92 CGHAz of weld metal is the lowest. Furthermore, the average impact and the strengthening effect caused by alloy elements for S304H strength value of weld metal is 57 J which is higher than ASME HAZ is stronger, in this case, S304H HAZ has higher strength than standard value(41 J), so the impact strength of the joints is qual T92 CGHAZ. With regard to weld metal, although the strengthen- ified. Meanwhile, the average impact strength values of T92 CGHAZ pole figure maps of (a)weld metal, and(b)S304H HAZthan that in T92 base material, indicating that S304H base material has higher strength than T92 base material [21]. Likewise, as the average grain size of S304H HAZ is similar to that of T92 CGHAZ and the strengthening effect caused by alloy elements for S304H HAZ is stronger, in this case, S304H HAZ has higher strength than T92 CGHAZ. With regard to weld metal, although the strengthen￾ing effect caused by grain boundary is weakest for its coarse den￾dritic austenitic grain, orientation distribution of grains in weld metal zone, giving rise to higher strength than T92 CGHAZ in trans￾verse direction of the joints (Figs. 8 and 10). As a result, the fracture location is taken place at the T92CGHAZ finally. 3.2.2. Impact toughness The impact test results of the joints are given in Fig. 12. It is clear that the average impact strength value of S304H base mate￾rial is the highest. In contrast, the average impact strength value of weld metal is the lowest. Furthermore, the average impact strength value of weld metal is 57 J which is higher than ASME standard value (>41 J), so the impact strength of the joints is qual￾ified. Meanwhile, the average impact strength values of T92 CGHAZ Fig. 10. EBSD grain orientation map of weld metal near S304H HAZ side. Fig. 9. Inverse pole figure maps of (a) T92 CGHAZ, and (b) weld metal. Fig. 11. Inverse pole figure maps of (a) weld metal, and (b) S304H HAZ. Table 2 Tensile test results of T92/S304H dissimilar materials joints. Sample no. Tensile strength (rs, MPa) Rupture position 1 689 T92 CGHAZ 2 677 T92 CGHAZ ASME T92 P620 / ASME S304H P655 / J. Cao et al. / Materials and Design 32 (2011) 2763–2770 2767
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