【摘要】：本文對高酸性油氣田用028鎳基合金N08028(028)輸油管道開發(fā)的熱加工工藝進行了探索和研究。028鎳基合金高溫?zé)崴苄暂^差、易變形區(qū)間較窄,無法采用常規(guī)熱穿孔工藝生產(chǎn),其只能通過熱擠壓工藝途徑來制造。本文主要通過制定028鎳基油管熱擠壓工藝參數(shù),并借助光學(xué)顯微鏡(OM)、掃描電子顯微鏡(SEM)和透射電子顯微鏡(TEM)等分析方法,研究了該合金在950℃～1200℃溫度范圍內(nèi)合金的熱變形規(guī)律。本文得出以下結(jié)論：028鎳基合金在950℃～1200℃溫度范圍內(nèi)變形時,合金的應(yīng)力應(yīng)變曲線屬于典型的動態(tài)再結(jié)晶曲線。隨著應(yīng)變速率的增加、變形溫度的降低,峰值應(yīng)力和穩(wěn)態(tài)應(yīng)力增加,而再結(jié)晶晶粒尺寸減小。高溫、低應(yīng)變速率條件下合金容易發(fā)生動態(tài)再結(jié)晶。通過處理實驗數(shù)據(jù)得到028鎳基合金的熱變形激活能為420.9kJ/mol,本構(gòu)方程和動態(tài)再結(jié)晶模型分別如下：ε=1.21669×1015[sinh(0.005912916σ)]3.56exp(-420886/RT) Xdrex=1-exp[-0.21×(ε-εc/ερ)1.33]合金的能耗峰值與動態(tài)再結(jié)晶的形核和生長過程相關(guān)：高應(yīng)變速率條件下,能耗峰值與再結(jié)晶形核過程有關(guān)；高溫條件下,能耗峰值與再結(jié)晶生長過程有關(guān)；低應(yīng)變速率、低溫條件下,能耗峰值與再結(jié)晶形核與生長過程相關(guān)。此外,在低溫、高應(yīng)變速率條件下,合金出現(xiàn)失穩(wěn)區(qū)。根據(jù)加工圖分析得到028鎳基合金的最優(yōu)熱加工條件,即變形的開始條件為1200℃、10s-1,結(jié)束條件為1100、0.1 s-1。這樣既能滿足實際需求,又能降低能耗,提高生產(chǎn)效率。
[Abstract]:In this paper, the hot processing technology of N08028 (028) N08028 (028) oil pipeline used in high acid oil and gas fields has been explored and studied. The high temperature thermoplasticity of .028 nickel-base alloy is poor, and the deformation range is narrow, so it is impossible to adopt the conventional hot piercing process. It can only be made by hot extrusion process. In this paper, the hot extrusion process parameters of 028 Ni-based tubing were established, and the analysis methods such as (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM) were used. The thermal deformation of the alloy was studied in the range of 950 鈩，

本文編號：2173919