moncler günstig Cast boride layer microstructure

Cast Microstructure observation of boride layer

# 215; prince Yu 3 boride layers of ancient bronze were trembling organization 100x3% HNO alcohol solution corrosion FiG3Mic ~ tructumofca obvious. (3) aluminum casting process can occur in the oxygen reaction 8A1 +3 FeOd = 9Fe +4- AIO,, and the resulting AI: O and slagging materials react with the slag formation and potassium reagents produced using three holes boride layer on the corrosion cast was found mainly by: B phase, and less FeB phase,[link widoczny dla zalogowanych], due to the toughness of Fe2B phase better than the FeB phase, the crack is not easy expansion 『,[link widoczny dla zalogowanych], so the organizational structure of boride layer to reduce the cast crisp harmony, improve the hardened layer and the bonding is of great significance. 2.2 ferrochrome particles in the microstructure morphology observed under a microscope using three samples of potassium aluminum corrosion reagents,[link widoczny dla zalogowanych], the specimen ferrochromium larger size and found that boride layer cast particles exist in the organization of inclusions, as shown in Figure 4. The triangular inclusions, boundary definition, preliminary analysis of the ferrochromium particles did not melt from the phase diagram of Fe-cr known, chromium high melting point of iron, and its melting point higher than 1300 ℃, higher than the pouring temperature. in the casting process, molten particles to blunt sharp corners, edges and corners with a hole, the particle edge and cast in Figure 4 boride layer morphology of the inclusions 6O0x tripotassium reagents corrosion Fig, 4Mo ~ hdogyIdine] usionsincast-boronized] ayer600 × an article number 2 of 17 an ounce :1003-8345 (2000) 04-0018-03 ④ study of aluminum heat-resistant cast iron . Quakie worm! Cut plastic net benevolent, Zhouzhuo Ping, Tan Duijiang kettle-type sheets trillion 'Keywords: Aluminum; ductile iron; of; even participate in the} correct Zan Kan power i .,, Key words: TG251.3 Document code: AI . -, Inves twenty gan0n0nMedium-Al snapped imImHeat-RestantN0duIar1r0n Yi was isolated from the parent state, the pointed part of the stress concentration, easily exceed the ultimate strength of infiltration layer and result in micro cracks, leaving the cast brittle boride layer, of cast boronizing effect of the use cases. inclusions ferrochromium alloy powder particle size is affected by the impact, if the alloy powder particle size is large, the inclusion of larger. and sample 3 due to the small particle size ferrochromium in the alloy layer in respect of labor was found in the presence of inclusions larger particles. Thus the granularity of boronizing agent casting of alloy layer is an important factor application effect. 2.3 Cast indentation hardness of boride layer and the cracks observed in the microhardness cast on the hardness of boride layer analysis found that had a crack near the indentation shown in Figure 5. It can be seen from the figure,[link widoczny dla zalogowanych], cast hardness of boride layer shaped indentation (load of 200g Holding Time 15s) stretch near the direction of herringbone boride collapse phenomenon slight indentation at the cusp of casting production in Figure 5 Microhardness of boride layer pressure rice Huang fine shape 6003% HNO solution corrosion Fig.5shapeofmlemh ~ dnessimpr ~ sionofcasl-bomni ~ dlayer600 × l8 a j. a small crack of Health, and the crack perpendicular to the direction of expansion of herringbone, described in the literature 【4】, boride in the direction of crack growth perpendicular to the direction of borides, Therefore we can say in casting boride boride layer growth direction is the direction of the fish bone extension. 3 Conclusions (1) by adding aluminum,[link widoczny dla zalogowanych], copper and other low melting point alloy can improve the cast boride layer and the substrate level of integration compared to the words, the density of copper alloy layer is good. (2) boride layer cast by the fish bone-like Fe: B phase and both FeB phase composition, and to Fe2B facies, cast alloy boride layer morphology of the particles from the alloy powder, powder particle size decision. (3) organization of casting produced boride layer is perpendicular to the crack extension direction of the fish bone, indicating the growth direction of boride bony fish is the stretch direction. References l】 Yuan Xu Hua Taiwan and other cast iron surface boxes of research and application】【J Casting .1987 {f1): 6 ~ 12.2】 Song Yuepeng boron steel such as a chromium layer of a brittle behavior of rare earth alloying of [JI Physical test (Physical Testing) .1998 {(6)} 3-53】 Zhang Xiaoling other surface tissues of cast austenite boronizing J】【metal heat treatment products of, 1999; (9J: 6l a 644】 LI Shu-Sen and other relative price of FeB brittle nature of electronic structure and vehicle】【J METAL i995: Af5): 20l an 207

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