本文選題：高通量連鑄連軋 + 中間退火　； 參考：《鄭州大學(xué)》2017年碩士論文

【摘要】：5XXX系鋁合金屬于不可熱處理強(qiáng)化型鋁合金,具有比重小,比強(qiáng)度高,良好的耐蝕性、焊接性和易于加工成形等優(yōu)點(diǎn),是交通運(yùn)輸工業(yè)的重要材料。5052鋁合金是5XXX系鋁合金中應(yīng)用范圍最廣的合金之一。高通量連鑄連軋工藝(即HTCR工藝)是一種新型高效的鋁合金板帶坯料生產(chǎn)工藝,該工藝具有短流程、生產(chǎn)效率高、節(jié)能環(huán)保等優(yōu)點(diǎn)。利用高通量連鑄連軋工藝生產(chǎn)的5052鋁合金板材,由于連鑄過程鋁液凝固速度較快,連軋過程板材溫度降低過快導(dǎo)致板材內(nèi)部組織不均勻、性能不穩(wěn)定。本文以高通量連鑄連軋工藝生產(chǎn)的6mm厚5052合金板坯作為試驗(yàn)材料,通過顯微組織分析、能譜分析、宏觀織構(gòu)分析、力學(xué)性能和成形性能測試等方法研究了中間退火、冷軋加工率、成品退火溫度及橫軋工藝對2mm厚5052合金成品板材的微觀組織、宏觀織構(gòu)、力學(xué)性能和成形性能的影響,為工業(yè)生產(chǎn)提供理論指導(dǎo)。主要研究結(jié)果如下:1.連鑄連軋工藝生產(chǎn)的6mm厚5052合金板材內(nèi)部組織為軋制組織。經(jīng)過480℃×8h中間退火后板材組織變?yōu)闉樵俳Y(jié)晶組織,且晶粒內(nèi)部析出大量細(xì)小的鋁鐵相粒子。6mm厚5052合金板材中間退火后冷軋至2mm,其完成再結(jié)晶過程所需時間較短,計算發(fā)現(xiàn)經(jīng)過中間退火的冷軋板材再結(jié)晶激活能為164.3KJ/mol,相比未中間退火冷軋板材降低了18%。2.經(jīng)過480℃×8h中間退火的5052合金冷軋板材和未中間退火5052合金冷軋板材中均含有黃銅織構(gòu)、S織構(gòu)和銅型織構(gòu)組分,其中中間退火板材軋制織構(gòu)最大強(qiáng)度為11,較未中間退火板材最大織構(gòu)強(qiáng)度低35%,另外中間退火冷軋板材中含有最大強(qiáng)度為5的立方織構(gòu)組分;中間退火5052合金再結(jié)晶板材和未中間退火5052合金再結(jié)晶板材中均含有立方織構(gòu)和R織構(gòu),中間退火板材再結(jié)晶織構(gòu)最大強(qiáng)度為6.6,較未中間退火再結(jié)晶板材最大織構(gòu)強(qiáng)度高15%。3.經(jīng)過480℃×8h中間退火的5052合金成品板材n值為0.396,相比未中間退火的成品板材高12.6%;經(jīng)過中間退火的成品板材r值為0.696,(35)r值為-0.084,相比未中間退火的成品板材r值低10.5%,(35)r值高54.8%;經(jīng)過中間退火的成品板材杯凸值為9.73,相比未中間退火的成品板材高1.1%。經(jīng)過中間退火的成品板材與未中間退火的成品板材相比,成形性能明顯提高。4.冷軋變形率和成品退火溫度對5052合金成品板材力學(xué)性能和成形性能均有顯著影響。冷軋變形率為66.7%,成品退火溫度為400℃保溫3h時,成品板材的抗拉強(qiáng)度為190.8Mpa,屈服強(qiáng)度為86.8Mpa,延伸率為26%,力學(xué)性能達(dá)到最佳;成品板材的n值平均值為0.409,r值平均值為0.695,(35)r值為-0.08,杯凸值為9.9,成形性能也達(dá)到最佳。5.橫軋軋制板材含有典型的沿?取向線分布的軋制織構(gòu)組分,直接冷軋軋制板材含有典型的沿β取向線分布的軋制織構(gòu)組分。橫軋A工藝軋制板材最大織構(gòu)強(qiáng)度為19,比直接冷軋板材高10.5%,橫軋B工藝軋制板材最大織構(gòu)強(qiáng)度為23,比直接冷軋板材高26.1%。橫軋成品板材中含有立方織構(gòu)和黃銅織構(gòu),直接冷軋成品板材中含有立方織構(gòu)和R織構(gòu)。橫軋A工藝成品板材立方織構(gòu)強(qiáng)度為2.9,比直接冷軋板材低47.3%,橫軋B工藝軋制板材立方織構(gòu)強(qiáng)度為2.6,比直接冷軋板材低52.7%。6.橫軋A工藝成品板材n值平均值為0.378,橫軋B工藝成品板材n值平均值為0.38,兩種橫軋成品板材的n值平均值比直接冷軋成品板材提高了8.9%;橫軋A工藝成品板材r值平均值為0.77,橫軋B工藝成品板材r值平均值為0.764,兩種橫軋成品板材的r值平均值與直接冷軋板材相比并未發(fā)生明顯變化;橫軋A工藝成品板材(35)r值為-0.156,比直接冷軋成品板材高16.1%,橫軋B工藝成品板材(35)r值為-0.09,比直接冷軋成品板材高51.6%;橫軋后的兩種板材杯凸值分別為9.7和9.67,比直接冷軋板材提高了0.8%。橫軋成品板材與直接冷軋成品板材相比,成形性能顯著改善。
[Abstract]:5XXX aluminum alloy is a kind of non heat-treated reinforced aluminum alloy. It has the advantages of small specific gravity, high specific strength, good corrosion resistance, weldability and easy processing..5052 aluminum alloy is one of the most widely used alloys in 5XXX system aluminum alloy. High flux continuous casting continuous rolling process (HTCR process) is one of the most important alloys. This technology has the advantages of short process, high production efficiency and energy saving and environmental protection. The 5052 aluminum alloy sheet produced by high flux continuous casting and continuous rolling process has fast solidification rate of aluminum liquid, and the internal structure of plate is not uniform in continuous rolling process, and the properties of the plate are not uniform. In this paper, the 6mm thick 5052 alloy slab produced by high flux continuous casting and rolling process is used as a test material. Through microstructure analysis, energy spectrum analysis, macroscopic texture analysis, mechanical properties and formability testing, the intermediate annealing, cold rolling processing rate, finished annealing temperature and cross rolling process for 2mm thick 5052 alloy sheet are studied. The effects of microstructure, macroscopic texture, mechanical properties and forming properties provide theoretical guidance for industrial production. The main results are as follows: 1. the internal microstructure of 6mm thick 5052 alloy sheet produced by continuous casting and continuous rolling process is rolled. After 480 C 8h intermediate annealing, the plate microstructure becomes recrystallized and the grain is precipitated in a large amount of fine grain. A small aluminum iron phase particle.6mm thick 5052 alloy sheet was annealed to 2mm in the middle, and the time needed to complete the recrystallization process was shorter. It was found that the activation energy of the recrystallization of the cold rolled sheet through intermediate annealing was 164.3KJ/mol. Compared with the unannealed cold rolled sheet, the 5052 alloy cold rolled sheet of 18%.2. after 480 C 8h intermediate annealing was reduced. The 5052 alloy cold rolled plate without intermediate annealing contains brass texture, S texture and copper type texture, of which the maximum strength of the rolling texture of the intermediate annealing plate is 11, and the maximum texture strength is 35% lower than that of the non intermediate annealing plate. In addition, the intermediate annealing cold rolled sheet contains the cube texture with the maximum strength of 5, and the intermediate annealing 5052 alloy is re bonded. The recrystallized sheet and unannealed 5052 alloy sheet contain cubic texture and R texture. The maximum strength of the recrystallized texture is 6.6, and the maximum texture strength of the annealed plate is higher than that of the unintermediate annealed sheet. The n value of 5052 alloy after annealing at 480 C 8h is 0.396, compared with the unannealed finished plate. The material is 12.6% high, the R value of the finished sheet after the intermediate annealing is 0.696, and the (35) r value is -0.084, which is 10.5% lower than that of the unannealed finished sheet metal 10.5%, (35) r value 54.8%, and the cup convex value of the finished plate is 9.73 after the intermediate annealing, and is 1.1% higher than that of the unannealed finished plate. The deformation ratio of.4. cold rolling and the annealing temperature of the finished product have significant influence on the mechanical properties and forming properties of the 5052 alloy sheet. The tensile strength of the finished sheet is 190.8Mpa, the yield strength is 86.8Mpa, the elongation is 26%, and the mechanical properties are 26%. The average value of n value of finished sheet is 0.409, the average value of R value is 0.695, (35) r value is -0.08, the cup convex value is 9.9, the forming performance also reaches the best.5. rolling rolling sheet, which contains typical rolling texture components along the orientation line distribution, and the direct cold rolled rolled sheet contains typical rolling texture along the beta orientation line. Cross rolling A The maximum texture strength of the rolled sheet is 19, which is 10.5% higher than that of the direct cold rolled sheet. The maximum texture strength of the rolled sheet rolled by the cross rolling B process is 23. The cubic texture and the brass texture are contained in the finished sheet of 26.1%. cross rolled products higher than the direct cold rolled sheet. The cubic texture and the R texture are contained in the direct cold rolled finished sheet. The cubic texture of the finished plate of the cross rolling A process is the cube texture of the finished sheet. The strength is 2.9, which is 47.3% lower than that of direct cold rolling sheet. The cubic texture strength of the rolled sheet rolling sheet of the cross rolling B process is 2.6, the average N value of the finished sheet of the 52.7%.6. cross rolling A process is 0.378 compared with the direct cold rolled sheet, and the mean value of the n value of the finished product plate of the cross rolling B process is 0.38. The average value of the n value of the two cross rolled finished sheet plates is 8.9% higher than that of the direct cold rolled sheet. The average value of R value of the finished sheet of cross rolling A process is 0.77, and the average r value of the finished product plate of the cross rolling B process is 0.764. The average r value of the two kinds of cross rolled finished products has not changed obviously compared with that of the direct cold rolled sheet. The finished sheet of the cross rolling A process is -0.156, 16.1% higher than the direct cold rolled sheet, and the finished sheet (35) r value of the cross rolling B process is (35) r value. The -0.09 is 51.6% higher than that of the direct cold rolled sheet, and the convex values of the two plate cups after cross rolling are 9.7 and 9.67 respectively. Compared with the direct cold rolled sheet, the forming properties of the 0.8%. cross rolled sheet and the direct cold rolled finished sheet are significantly improved.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG339;TG166.3

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本文編號：2109824