【摘要】：隨著鋼鐵冶煉技術(shù)的發(fā)展,軋制成為帶鋼生產(chǎn)中主要的生產(chǎn)工藝。其中主要包括冷軋、熱軋以及雙輥薄帶連鑄,所得產(chǎn)品的晶粒得到細(xì)化,組織性能較好,連鑄連軋的生產(chǎn)方式如今已成為鋼鐵生產(chǎn)領(lǐng)域最為先進(jìn)的的生產(chǎn)方式。軋輥是軋制工藝的核心部件,在熱軋以及雙輥薄帶連鑄的實(shí)際生產(chǎn)過(guò)程中,結(jié)晶輥輥需承受復(fù)雜多變的高溫及應(yīng)力載荷。軋輥除了正常的摩擦磨損失效,其主要的失效形式是軋輥工作面產(chǎn)生疲勞裂紋,疲勞失效是實(shí)際生產(chǎn)中軋輥主要的失效形式。由于軋輥的價(jià)格成本較高,因此延長(zhǎng)軋輥的使用壽命,準(zhǔn)確預(yù)測(cè)其疲勞失效規(guī)律,對(duì)于提升產(chǎn)品質(zhì)量和性能以及降低生產(chǎn)成本具有重要意義。通過(guò)分析國(guó)內(nèi)外學(xué)者所做的相關(guān)研究,歸納了對(duì)軋輥疲勞裂紋的產(chǎn)生和擴(kuò)展有著重影響的諸多因素。根據(jù)雙輥薄帶鑄軋實(shí)際生產(chǎn)過(guò)程中結(jié)晶輥出現(xiàn)的熱疲勞失效問(wèn)題,自行設(shè)計(jì)制作了熱疲勞失效實(shí)驗(yàn)裝置。通過(guò)實(shí)驗(yàn)的方法研究了,在一定載荷下,不同溫度梯度對(duì)疲勞裂紋擴(kuò)展的影響;不同的加熱、冷卻頻率對(duì)熱疲勞裂紋擴(kuò)展的影響;有無(wú)鎳鍍層對(duì)基體熱疲勞裂紋擴(kuò)展的影響;在高溫循環(huán)加熱條件下,基體疲勞裂紋萌生及擴(kuò)展機(jī)理。通過(guò)分析得到,在施加一定載荷作用下,隨著加熱溫度的升高,內(nèi)部交變熱應(yīng)力增大,銅基體的熱疲勞裂紋前期擴(kuò)展加快;當(dāng)接觸加熱時(shí)間延長(zhǎng)時(shí),處于最大熱應(yīng)力狀態(tài)時(shí)間增加,裂紋擴(kuò)展初期較快,隨著裂紋擴(kuò)展尖端應(yīng)力得到釋放,裂紋擴(kuò)展速率下降明顯;鎳鍍層具有一定的阻熱性,帶有鎳鍍層的銅基體熱疲勞裂紋的擴(kuò)展長(zhǎng)度略低于無(wú)鎳鍍層時(shí)銅基體的熱疲勞裂紋擴(kuò)展;高溫條件下,裂紋尖端大量金屬氧化物加速了疲勞裂紋的擴(kuò)展。
[Abstract]:With the development of iron and steel smelting technology, rolling has become the main production process in strip steel production. It mainly includes cold rolling, hot rolling and double roll strip continuous casting. The grain size of the product is refined and the structure and properties are better. The production mode of continuous casting and rolling has become the most advanced mode of production in the field of iron and steel production. Roll is the core part of rolling process. In the process of hot rolling and double roll thin strip continuous casting, the crystal roll has to bear complex high temperature and stress load. In addition to the normal friction and wear failure, the main failure form of roll is fatigue crack in roll face, and fatigue failure is the main failure form of roll in actual production. Because of the high price and cost of roller, it is very important to prolong the service life of roller and accurately predict its fatigue failure law to improve the quality and performance of product and reduce the production cost. By analyzing the relevant research done by scholars at home and abroad, many factors which have important influence on the production and propagation of roll fatigue cracks are summarized. According to the thermal fatigue failure of the crystal roll in the production process of twin-roll thin strip casting, a thermal fatigue failure test device was designed and manufactured by ourselves. The effects of different temperature gradients on fatigue crack propagation, different heating and cooling frequency on thermal fatigue crack propagation, and the effect of nickel coating on thermal fatigue crack growth of substrate were studied by experimental method. The fatigue crack initiation and propagation mechanism of matrix under high temperature cyclic heating condition. Through analysis, under certain load, with the increase of heating temperature, the internal alternating thermal stress increases, the thermal fatigue crack Prophase growth of copper matrix is accelerated, and when the contact heating time is prolonged, In the state of maximum thermal stress, the initial stage of crack growth is faster, and the crack growth rate decreases obviously with the release of crack tip stress, and the nickel coating has a certain thermal resistance. The thermal fatigue crack propagation length of copper substrate with nickel coating is slightly lower than that of copper substrate without nickel coating, and the fatigue crack propagation is accelerated by a large number of metal oxides at the crack tip at high temperature.
【學(xué)位授予單位】：山東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG333.17

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