Studies on Microstructure and Texture of SN490B Construction Steel GMAW Weldment
碩士 === 國立臺灣科技大學 === 材料科技研究所 === 95 === The microstructure and texture of SN490B construction steel GMAW weldment was studied. As a result, the hardness of GCHAZ was highest and the impact toughness was lowest than that of other. The fracture surface of impact specimen was cleavage. The microstructur...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2007
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| Online Access: | http://ndltd.ncl.edu.tw/handle/fz48uj |
| Summary: | 碩士 === 國立臺灣科技大學 === 材料科技研究所 === 95 === The microstructure and texture of SN490B construction steel GMAW weldment was studied.
As a result, the hardness of GCHAZ was highest and the impact toughness was lowest than that of other. The fracture surface of impact specimen was cleavage. The microstructure of weld metal was consisted of grain boundary ferrite PF(G), ferrite side plate FS(SP) and acicular ferrite AF. The microstructure of GCHAZ was upper bainite FS(UB). The grain of GCHAZ and weld metal had been finer due to the effect of the following welding. The {110} pole figure of base metal has weak {110} fiber texture and the texture of the temper zone and the reheated grain-refined zone were random. The grain was easily to growth with crystal orientation between [101] and [112] for GCHAZ, [001] for fusion zone and [111] for weldment shown on orientation map of ND. The {110} pole figure of GCHAZ and weldment has {001}, {112} and {111} mixed texture。
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