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abcqingwei新蟲 (初入文壇)
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[交流]
焊接 論文英文摘要求指教更正
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摘 要:采用不同熱輸入對12mmSS400中厚板進行焊接,通過對焊接接頭過熱區(qū)、正火區(qū)及不完全正火區(qū)晶粒長大程度與組織變化情況的分析,研究焊接熱影響區(qū)及各子區(qū)寬度、組織、硬度隨熱輸入的變化規(guī)律。試驗結果表明,熱輸入為9.6~22kJ/cm進行焊接時,HAZ及各子寬度變化較小,基本保持在2mm左右。當熱輸入大于22kJ/cm時,HAZ寬度隨熱輸入的增加而增加,尤其正火區(qū)寬度大幅增長。此外隨著熱輸入增加,過熱區(qū)組織中片狀珠光體減少,逐步形成粗大的魏氏組織。同時,接頭硬度峰值逐漸升高,局部軟化區(qū)逐漸擴大,使接頭性能變差。 關鍵詞:SS400;顯微組織;晶粒長大;HAZ寬度;硬度分布 Abstract: The 12mm SS400 medium plate is welded in the ways of different heat Input, through the analysis of the growths of grains and microstructure variation on coarse grain heat-affected zone(CGHAZ),fine grained heat-affected zone(FGHAZ)and incomplete normalized zone, to study the changing rules of width,microstructure and microhardness in welding HAZ and all sub-areas with the variation of heat-input. The result shows that when it welded in the heat input of 9.6~22kJ/cm, the SS400 has a small impact on the width of HAZ and all sub-areas, which maintains about 2mm. While the heat input is more than 22kJ/cm, the width of HAZ will increasing, especially leads to the substantial increasing of width in FGHAZ. Morever, with the heat input increasing lamellar pearlite in incomplete normalized zone microstructure will decrease and form widmanstatten structure gradually. Meanwhile, the hardness peak of joint will became higher and softened zone expands gradually, which make the joint property get worse. Key Words: SS400; microstructure; grain growth; the width of HAZ; hardness distribution |
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