Fig. 5 The metallographic specimen, 40B 1 , after polishing and etching showing a general view of the cracks that grew from the outside of the collector to the interior together with others growing in the opposite direction. Note the repair weld applied without total removal of the external More

Fig. 2 The grinding/polishing head of the Di-Profiler which is driven by the motor through a flexible shaft. More

Fig. 3 Unetched polished section taken from → ← in Fig. 1 . 10× More

Fig. 1 Deformation by slip on the surface of a polished rod specimen (St 37) subjected to reverse bending, with beginning of crack formation (slightly etched during electropolishing). 200× More

Fig. 2 Slag streak in unetched longitudinal polished section. 100 × More

Fig. 1 Fractured piston rod showing polished face of nut. More

Fig. 2 Polished-and-etched cross section through the failed safe-end of the recirculation inlet nozzle. Note the intergranular nature of the failure. Etched in 8:1 phosphoric acid. 53× More

Fig. 2 Polished specimen from the site of the fracture etched with ammonium persulphate showing branched transcrystalline cracks lying to the right of the main crack visible in Fig. 1 . 200 × More

Fig. 3 Unetched polished section taken through the point marked in Fig. 2 . 20× More

Fig. 4 Microstructure of a polished specimen from the wide pipe etched with ammonium persulphate. 200× More

Fig. 2 Polished-and-etched cross section of a section of the failed melting pot shown in Fig. 1 . The ferrite and pearlite constituents normally found in hot-rolled carbon steel and large anomalous inclusions are evident. More

Fig. 3 Affected area in polished and unetched condition. 50× More

Fig. 4 Large irregular and flat slag inclusions (as polished), at ×100 More

Fig. 7 Cross section of reduced wall thickness, as polished, showing general pitting (cratering) 50× More

Fig. 4 Polished/etched section of weld metal at boundary of void in Figure 3 . Preferential corrosion is evident. 300×. More

Fig. 12 Photomacrograph of polished stainless steel weld sample attacked by MIC. Pit “a” was chosen for study. It is entirely in the weld filler zone. Magnification ∼ 4×. More

Fig. 10 Micrograph of as-polished tubing. Again note the small opening of the pit (arrow) as compared to the overall dimension of the pit. Magnification: 100× More

Fig. 4 Intergranular crack in the as-polished condition, at × 400 More

Fig. 3 Polished and etched (nital) taper section adjacent to the end of one of the bands. Magnification 400× a - Base steel (52100); fine dispersion of alloy carbides in tempered martensite matrix. b - White fresh martensite caused by reheating of the surface by the spark discharge. c More

Fig. 1 Top Left — Polished cross section of two adjacent coils. Typically, exposed surface is rough, while unexposed areas near crevice between coils is comparatively smooth. More