(a) Fig 3 Metallographic microstructures of the different regions across the t91 welded joints(a)HAZ (b)weld seam (b) M23C6 (c)、 a Fig 4 TEM micrographs of the different regions across the T91 welded joints (a) HAZ, 28,000;(b)HAZ, x35,000;(c)weld seam, 22,000;(d) weld seam,x35,000 1316-Volume 21(7) July 2012 Journal of Materials Engineering and PerformanceFig. 3 Metallographic microstructures of the different regions across the T91 welded joints (a) HAZ (b) weld seam Fig. 4 TEM micrographs of the different regions across the T91 welded joints (a) HAZ, 928,000; (b) HAZ, 935,000; (c) weld seam, 922,000; (d) weld seam, 935,000 1316—Volume 21(7) July 2012 Journal of Materials Engineering and Performance