本文關(guān)鍵詞：雙輥薄帶振動鑄軋振動工藝對凝固組織影響機(jī)理實驗研究　出處：《燕山大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 雙輥鑄軋 振動鑄造 晶粒度 成分偏析 宏觀缺陷

【摘要】：雙輥薄帶鑄軋作為一種近終成形鑄軋技術(shù)手段,相對傳統(tǒng)連鑄具有能耗低、效率高等優(yōu)勢。然而部分傳統(tǒng)雙輥鑄軋板帶坯存在組織不均勻,晶粒粗大,柱狀晶發(fā)達(dá),成分偏析嚴(yán)重等缺陷,最終會降低材料力學(xué)性能。針對這些缺陷,振動式雙輥薄帶鑄軋機(jī),在傳統(tǒng)雙輥薄帶鑄軋技術(shù)基礎(chǔ)上,通過在單側(cè)結(jié)晶輥上施加激振源改變流場和溫度場,達(dá)到細(xì)化組織,減輕偏析的效果。本文針對此種振動工藝對金屬組織影響規(guī)律開展了實驗研究。利用振動式雙輥薄帶鑄軋機(jī)作為振動實驗平臺,自主設(shè)計了振動鑄造的實驗方案,并完成了實驗設(shè)備的設(shè)計、加工、裝配以及調(diào)試工作。將振動鑄造實驗結(jié)果,與常規(guī)鑄造工藝鑄件,急速冷卻無振動鑄造工藝鑄件進(jìn)行實驗對比分析,通過對其金相組織觀察以及成分偏析分析,發(fā)現(xiàn)振動工藝相對傳統(tǒng)鑄造工藝,對鑄件晶粒組織的細(xì)化,成分偏析的改善,以及力學(xué)性能的提升均起到了積極作用,且有效改善了傳統(tǒng)鑄造工藝中存在的縮孔,縮松、裂紋等宏觀缺陷�？紤]振動過程中薄帶是否與結(jié)晶輥脫離等因素,提出了振動工藝參數(shù)的選取條件,選取13組不同振動參數(shù)進(jìn)行振動鑄造正交對比實驗,通過實驗結(jié)果對比,驗證了參數(shù)選取條件的合理性。通過對不同振頻、振幅工藝條件下所鑄鑄件的實驗結(jié)果對比,發(fā)現(xiàn)在振頻25Hz以內(nèi),振幅0.5mm以內(nèi),隨著參數(shù)值提高,形核率不斷提升,中心等軸晶區(qū)不斷擴(kuò)大,金屬內(nèi)部不同低量元素的正常偏析以及比重偏析現(xiàn)象逐步得到改善,但振幅超過0.5mm以后,改善效果不再明顯,甚至惡化了金屬組織。
[Abstract]:As a technical means of near-end forming casting and rolling, twin-roll thin strip casting has the advantages of low energy consumption and high efficiency compared with traditional continuous casting. However, some traditional double-roll casting strip billets have uneven microstructure and coarse grain size. The mechanical properties of materials will be reduced because of the developed columnar crystal and the serious segregation of composition. In view of these defects, the vibrating double-roll strip casting mill is based on the traditional twin-roll strip casting technology. The flow field and temperature field were changed by applying the exciting source on the single side crystal roller, and the microstructure was refined. In this paper, the effect of this vibration process on the metal structure was studied experimentally. The vibrating double-roll strip casting mill was used as the vibration test platform. The experiment scheme of vibration casting was designed, and the design, processing, assembly and debugging of the experimental equipment were completed. The experimental results of vibration casting were compared with those of conventional casting technology. Through the comparative analysis of the rapid cooling and vibration free casting technology, the microstructure of the casting was observed and the composition segregation was analyzed. It was found that the vibration process was more precise than the traditional casting process to refine the grain structure of the casting. The improvement of composition segregation and the improvement of mechanical properties all played a positive role, and effectively improved the shrinkage and porosity in the traditional casting process. Considering whether the strip is separated from the crystal roll during vibration, the selection conditions of vibration parameters are put forward, and 13 groups of different vibration parameters are selected to carry out the orthogonal contrast experiment of vibration casting. Through the comparison of the experimental results, the rationality of the parameter selection conditions is verified. By comparing the experimental results of casting castings with different vibration frequency and amplitude, it is found that the vibration frequency is less than 25 Hz. Within 0.5 mm amplitude, with the increase of parameter value, the nucleation rate increases, the central equiaxed crystal region expands continuously, and the normal segregation and specific gravity segregation of different low-volume elements in the metal are gradually improved. However, when the amplitude exceeds 0.5 mm, the improvement effect is no longer obvious, and even the metal structure is deteriorated.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG24

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本文編號：1378225