銅基鎳鍍層雙金屬試樣高溫熱疲勞損傷機理研究
發(fā)布時間：2018-08-05 15:07
【摘要】：隨著鋼鐵冶煉技術的發(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)領域最為先進的的生產(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際生產(chǎn)過程中,結晶輥輥需承受復雜多變的高溫及應力載荷。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,疲勞失效是實際生產(chǎn)中軋輥主要的失效形式。由于軋輥的價格成本較高,因此延長軋輥的使用壽命,準確預測其疲勞失效規(guī)律,對于提升產(chǎn)品質(zhì)量和性能以及降低生產(chǎn)成本具有重要意義。通過分析國內(nèi)外學者所做的相關研究,歸納了對軋輥疲勞裂紋的產(chǎn)生和擴展有著重影響的諸多因素。根據(jù)雙輥薄帶鑄軋實際生產(chǎn)過程中結晶輥出現(xiàn)的熱疲勞失效問題,自行設計制作了熱疲勞失效實驗裝置。通過實驗的方法研究了,在一定載荷下,不同溫度梯度對疲勞裂紋擴展的影響;不同的加熱、冷卻頻率對熱疲勞裂紋擴展的影響;有無鎳鍍層對基體熱疲勞裂紋擴展的影響;在高溫循環(huán)加熱條件下,基體疲勞裂紋萌生及擴展機理。通過分析得到,在施加一定載荷作用下,隨著加熱溫度的升高,內(nèi)部交變熱應力增大,銅基體的熱疲勞裂紋前期擴展加快;當接觸加熱時間延長時,處于最大熱應力狀態(tài)時間增加,裂紋擴展初期較快,隨著裂紋擴展尖端應力得到釋放,裂紋擴展速率下降明顯;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展長度略低于無鎳鍍層時銅基體的熱疲勞裂紋擴展;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.
【學位授予單位】：山東理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG333.17
本文編號：2166164
[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.
【學位授予單位】：山東理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG333.17
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