本文選題：激光修復　切入點：沖擊韌性　出處：《應用激光》2016年06期 　論文類型：期刊論文

【摘要】：研究了激光修復300M超高強度鋼沖擊韌性及斷裂機理。結果表明,激光修復300M超高強度鋼沉積態(tài)的顯微組織從修復區(qū)頂部到基材區(qū)發(fā)生了顯著變化,經過熱處理后顯微組織發(fā)生明顯均勻化,修復試樣沉積態(tài)的沖擊韌性為14.3J/cm2,遠低于300M超高強度鋼鍛件。經過熱處理后,沖擊韌性有了顯著地提高,達到28.3J/cm2。沉積態(tài)試樣的斷裂方式為準解理斷裂,主裂紋在擴展的過程中橫穿馬氏體領域,且在遇到下一個領域時會發(fā)生偏轉。熱處理態(tài)試樣的斷裂方式為韌性斷裂。
[Abstract]:The impact toughness and fracture mechanism of 300M ultrahigh strength steel repaired by laser are studied. The results show that the microstructure of laser repairing 300M ultrahigh strength steel has changed significantly from the top of the repair zone to the base material area. After heat treatment, the microstructure was obviously homogenized, and the impact toughness of the deposited specimen was 14.3J / cm ~ 2, which was much lower than that of 300m ultra-high strength steel forgings. After heat treatment, the impact toughness was improved significantly. The fracture mode of the deposited specimen is quasi-cleavage fracture, the main crack crosses the martensite field during the process of propagation, and will deflect in the next field. The fracture mode of the heat-treated specimen is ductile fracture.
【作者單位】： 西北工業(yè)大學凝固技術國家重點實驗室;
【基金】：國家自然科學基金資助項目(項目編號:51323008;51475380;51501154) 高等學校學科創(chuàng)新引智計劃資助項目(項目編號:08040)
【分類號】：TG142.1;TG665

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1 王魯;航天工業(yè)部超高強度鋼的應用、發(fā)展與規(guī)劃專題討論會在常熟召開[J];宇航材料工藝;1984年03期

2 王魯;殼體超高強度鋼的研究應用現狀及近期發(fā)展方向[J];宇航材料工藝;1984年06期

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本文編號：1619635