The Effect of Silicon Content on the Mechanical Properties of Welded （Stainless and Carbon Steels）
碩士 === 義守大學 === 材料科學與工程學系碩士班 === 94 === The 309L stainless steels wires doped with different silicon contents, 0.25wt%, 0.45wt% and 0.65wt%, were used in this study. The SAE 1017 carbon steel and SS 304L stainless steels are welded together as test materials. The first step was an Argon Gas Tungsten...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2006
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| Online Access: | http://ndltd.ncl.edu.tw/handle/39078043060363401712 |
| Summary: | 碩士 === 義守大學 === 材料科學與工程學系碩士班 === 94 === The 309L stainless steels wires doped with different silicon contents, 0.25wt%, 0.45wt% and 0.65wt%, were used in this study. The SAE 1017 carbon steel and SS 304L stainless steels are welded together as test materials. The first step was an Argon Gas Tungsten Arc Welding (GTAW) and then Shield Metal Arc Welding (SMAW) to join these bi-steels completely.
After welding the different samples are experimented by tensile test and hardness test. The fracture morphologies of samples have been observed by OM and SEM investigation. The results show there are not any cracks on samples after welding and hardness is increased with the increasing of silicon contents. The fracture sites are located in carbon steels after tensile test and tensile strength are similar at the fusion zone. The impact energy is similar on fusion zone at -29℃ and -70℃.The highest impact energy is local at the interface between stainless steels and fusion zone , but it is lowest between carbon steels and fusion zone.
The results show lath ferrite becomes to Widmannstaetten structure of fine grains with the increasing of silicon contents. The P.F.Z. of the interface between fusion zone and carbon steels is increased with the increasing of silicon contents. The ferrite shape becomes to net structure from columnar structure in the center of fusion zone.
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