本文選題：中厚板 + 返溫軋制��； 參考：《金屬學(xué)報》2017年05期

【摘要】：研究了返溫軋制(TRRP)中厚鋼板表層的組織特征及其對止裂性能的影響。力學(xué)性能測試結(jié)果表明,與傳統(tǒng)的控軋控冷(TMCP)鋼相比,TRRP鋼表層的韌、塑性較好,韌脆轉(zhuǎn)變溫度低至-100℃,而在1/4厚度處,兩者性能差異不大。顯微組織分析表明,TRRP鋼表層組織為等軸狀鐵素體晶粒+彌散分布的馬氏體-奧氏體(MA)組元,晶粒等效直徑約2 mm。通過數(shù)值模擬分析了TRRP工藝中間坯溫度場的變化,發(fā)現(xiàn)中間坯冷卻時,表層被冷卻到相變溫度以下,形成以貝氏體為主的組織,返溫后軋制,表層組織發(fā)生動態(tài)再結(jié)晶形成超細(xì)晶。示波沖擊測試表明,TRRP鋼表層試樣啟裂后,載荷-位移曲線斜率絕對值(|k|)由0.66降低到0.27,與止裂相關(guān)的沖擊吸收功達(dá)到44.3 J,斷口表層組織有明顯的塑性變形,吸收了裂紋擴(kuò)展的能量,有效地抑制了裂紋擴(kuò)展。晶粒取向分析表明,TRRP鋼表層超細(xì)晶粒取向呈隨機(jī)分布,晶界角度平均值和大角度晶界(15°)比例分別達(dá)到32.8°和69.8%,能夠有效阻礙裂紋擴(kuò)展。使用納米壓痕分析了實驗鋼的硬度,TRRP鋼表層的納米壓痕硬度統(tǒng)計分布集中在2.0 GPa以下,組織特征為少量的硬質(zhì)相彌散分布在較軟的鐵素體基體上,相界面處萌生的裂紋在基體中不易擴(kuò)展。
[Abstract]:The microstructure characteristics of the surface layer of the medium and thick steel plate in the back temperature rolling (TRRP) and its effect on the crack arrest have been studied. The results of mechanical properties test show that, compared with the traditional controlled rolling and controlled cooling (TMCP) steel, the toughening and plastic properties of the TRRP steel are better, the transition temperature of the ductile and brittle transition is low to -100 C, and the properties of the two are not very different at the thickness of 1/4. Microstructure analysis shows that TRR The surface structure of P steel is an equiaxed ferrite grain + diffusion distributed martensitic austenite (MA) component. The equivalent diameter of the grain is about 2 mm., and the change of the temperature field of the intermediate billet in the TRRP process is analyzed by numerical simulation. It is found that the surface layer is cooled to below the phase transition temperature when the medium is cooled, and the bainite is the main structure, and the surface is rolled and the surface is rolled. The dynamic recrystallization of the tissue is superfine crystal. The oscilloscope impact test shows that the absolute value of the slope of the load displacement curve (|k|) is reduced from 0.66 to 0.27 after the cracking of the TRRP steel surface specimen, and the impact absorption work related to the crack arrest is 44.3 J, and the surface structure of the fracture surface has obvious plastic deformation, absorbing the energy of the crack expansion and effectively restraining the crack. Grain orientation analysis shows that the grain orientation of the TRRP steel surface is randomly distributed, the average value of the grain boundary angle and the large angle grain boundary (15 degrees) reach 32.8 and 69.8%, respectively, which can effectively prevent the crack growth. The hardness of the experimental steel is analyzed by nano indentation. The statistical distribution of nano indentation hardness on the surface of TRRP steel is concentrated at 2 GPa The microstructure is characterized by a small amount of hard phase dispersed on the softer ferrite substrate, and the cracks at the interface are not easy to expand in the matrix.
【作者單位】： 洛陽船舶材料研究所;鋼鐵研究總院工程用鋼所;
【分類號】：TG142.1;TG335.5

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