λ>V和Tb>V>λ。并且隨著擠壓速度的增加管材平均晶粒尺寸增大，管材晶粒均勻性降低；隨著坯料初始溫度的升高和擠壓比的增大管材晶粒尺寸減小，管材晶粒分布更加均勻"/>

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Microstructure Responses to Key Extrusion Parameters of Large-Scale Thick-Walled 304 Stainless Steel Pipes Extrusion
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Microstructure Responses to Key Extrusion Parameters of Large-Scale Thick-Walled 304 Stainless Steel Pipes Extrusion
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Major National Science and Technology Special Project of China (2009ZX04005-031-11); the Research Fund of State Key Laboratory of Solidification Processing of China (KP200911); the “111” Project (B08040)

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    摘要:

    首先建立能夠準(zhǔn)確預(yù)測(cè)304不銹鋼大型厚壁管擠壓成形過(guò)程中動(dòng)態(tài)結(jié)晶組織演化行為的精確有限元模型。其次，利用所建有限元模型，通過(guò)正交回歸法確定對(duì)管材晶粒尺寸及其均勻性影響顯著的因素。最后，通過(guò)單因素法分析了影響顯著參數(shù)對(duì)管材晶粒尺寸及其均勻性的影響規(guī)律。結(jié)果表明：擠壓速度(V)，擠壓比(λ)和坯料預(yù)熱溫度(Tb)是影響晶粒及其均勻性的主要因素，影響顯著次序分別為T(mén)b>λ>V和Tb>V>λ。并且隨著擠壓速度的增加管材平均晶粒尺寸增大，管材晶粒均勻性降低；隨著坯料初始溫度的升高和擠壓比的增大管材晶粒尺寸減小，管材晶粒分布更加均勻

    Abstract:

    A finite element (FE) model for the extrusion process of large-scale thick-walled 304 stainless steel pipes was firstly developed based on DEFORM-2D platform, which can predict the DRX evolution behavior by coupling with a DRX model of 304 stainless steel. Secondly, the influence of the above key extrusion parameters on the average grain size and the grain uniformity of the extruded pipe were investigated by a liner orthogonal regression method. Finally, the influence laws of the key parameters on the average grain size and the grain uniformity were analyzed by a single factor method. The results show that extrusion speed V, initial billet temperature Tb and extrusion ratio λ have more obvious effects on the average grain size and the grain uniformity than other ones, and the influence sequences of these parameters to the average grain size and the grain uniformity are Tb>λ>V and Tb>V>λ, respectively. And the average grain size becomes smaller and the grain uniformity gets enhanced with the decrease of V and the increase of Tb and λ

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黨 利,楊 合,郭良剛,石 磊,張 君,鄭文達(dá). Microstructure Responses to Key Extrusion Parameters of Large-Scale Thick-Walled 304 Stainless Steel Pipes Extrusion[J].稀有金屬材料與工程,2014,43(11):2675~2681.[Dang Li, Yang He, Guo Lianggang, Shi Lei, Zhang Jun, Zheng Wenda. Microstructure Responses to Key Extrusion Parameters of Large-Scale Thick-Walled 304 Stainless Steel Pipes Extrusion[J]. Rare Metal Materials and Engineering,2014,43(11):2675~2681.]
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  • 收稿日期:2013-11-25
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  • 在線發(fā)布日期: 2015-04-07
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