非外延生长 Weld Metal Equiaxed Region B Base Metal 40m Acc.V Spot Magn Det WD 20m 20.0 kV 4.0 1600x SE 10.0 409-Monel (WF=30ipm Fusion boundary microstructure in 409 ferritic stainless steel (bcc)welded with Monel filler wire (fcc):(a) optical micrograph;(b)scanning electron micrograph非外延生长 Fusion boundary microstructure in 409 ferritic stainless steel (bcc) welded with Monel filler wire (fcc): (a) optical micrograph; (b) scanning electron micrograph