節(jié)Ni型2101雙相不銹鋼的高溫?zé)峒庸ば袨檠芯?/h1>
節(jié)Ni型2101雙相不銹鋼的高溫?zé)峒庸ば袨檠芯?span style="font-size:14px;color:#000000;font-family:Arial;">Research on Hot Working Behavior of Low-Nickel Duplex Stainless Steel 2101 采用Gleeble-3800熱力模擬實驗機在溫度為1123~1423 K，應(yīng)變速率為0.001~10 s?1的條件下對2101雙相不銹鋼進行了熱壓縮實驗，以研究熱變形參數(shù)對其熱加工行為影響規(guī)律。相同應(yīng)變速率下，隨溫度升高，流變曲線由動態(tài)再結(jié)晶向動態(tài)回復(fù)轉(zhuǎn)變。變形速率由0.001 s?1增至0.01 s-1和0.1 s-1提高了動態(tài)再結(jié)晶溫度范圍，而1 s-1和10 s-1的較高應(yīng)變速率不利于動態(tài)再結(jié)晶。在0.001-0.1s-1較低應(yīng)變速率的1253-1323 K中溫區(qū)，峰值應(yīng)力所對應(yīng)的應(yīng)變值越小，奧氏體動態(tài)再結(jié)晶越容易發(fā)生，有利于等軸狀再結(jié)晶組織形成。低應(yīng)變速率下，變形溫度升高使奧氏體再結(jié)晶晶粒長大，且Z值較大時，動態(tài)再結(jié)晶效果變差與Mn穩(wěn)定奧氏體能力較Ni弱有關(guān)?；跓嶙冃畏匠逃嬎愕玫皆摬讳P鋼熱變形激活能Q=464.49 kJ/mol，略高于2205雙相不銹鋼，并建立了峰值流變應(yīng)力本構(gòu)方程。結(jié)合不同變形條件下的應(yīng)變曲線和顯微組織，根據(jù)熱加工圖確定了最佳熱加工區(qū)域為應(yīng)變速率在0.001~0.1 s-1，變形溫度為1220~1350 K，該區(qū)域功率耗散系數(shù)處于0.40~0.47的較高值，發(fā)生了明顯奧氏體動態(tài)再結(jié)晶。 The thermal deformation difference of two phases for duplex stainless steel (DSS) makes hot working difficult, 2101 DSS substitute Mn, N for Ni to stabilize austenite phase, which will significantly affect hot deformation behavior. Hot compression tests in the temperature ranging from 1123 to 1423 K and strain rate ranging from 0.001 to 10 s-1 were carried out on a Gleeble-3800 thermal simulator for 2101 DSS. At the same strain rate, the flow curve characteristics of 2101 DSS changed from dynamic recrystallization (DRX) to dynamic recovery with increasing deformation temperature. Increasing deformation stain rate from 0.001 s-1 to 0.01 and 0.1s-1 increased DRX temperature range, but higher strain rate of 1s-1 and 10s-1 is not beneficial to DRX occurrence. In the middle deformation temperature region of 1253-1323 K and low strain rate of 0.001-0.1 s-1, the smaller strain value corresponding to the peak stress, the austenite DRX is more likely to occur, which is beneficial to the equiaxed recrystallized grains formation. At low strain rate, the recrystallization grain grows up with the increase of deformation temperature, the worse effect of austenite DRX is related to weakened austenite stabilized ability of Mn substitution for Ni at high Z values. Based on the thermal deformation equation, the apparent activation energy Q was calculated as 464.49 kJ/mol, which is slightly higher than that of 2205 DSS, and the constitutive equation of the peak flow stress was established. By combining with flow curve and microstructure analysis, the processing map exhibits the optimum processing conditions are in deformation temperature ranging from 1220 to 1350 K and strain rate ranging from 0.001 to 0.1 s-1 with high power dissipation coefficient of 0.40~0.47, under which the austenite DRX obviously occurred. 全文下載：https://pan.baidu.com/s/1nvmiyV3 下一篇： 可降解鋅基生物材料的研究進展
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