(1. 河南科技大學(xué) 材料科學(xué)與工程學(xué)院，洛陽(yáng) 471003；
2. 河南科技大學(xué) 河南省有色金屬材料科學(xué)與加工技術(shù)重點(diǎn)實(shí)驗(yàn)室，洛陽(yáng) 471003；
3. 燕山大學(xué) 亞穩(wěn)材料制備技術(shù)與科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室，秦皇島 066004；
4. 中國(guó)人民解放軍63883部隊(duì)，洛陽(yáng) 471000)
摘 要: 在變形溫度為1 050~1 180 ℃、應(yīng)變速率為0.1~10 s−1、最大真應(yīng)變?yōu)?.7的條件下，采用Gleeble−3500熱模擬試驗(yàn)機(jī)研究GH4199合金的熱壓縮變形行為，得到該合金的熱變形激活能及熱變形方程式，建立合金的熱加工圖，并通過(guò)組織觀察對(duì)其熱加工圖進(jìn)行解釋。結(jié)果表明：在實(shí)驗(yàn)條件下，GH4199合金均表現(xiàn)出動(dòng)態(tài)再結(jié)晶特征；變形溫度和應(yīng)變速率對(duì)合金流變應(yīng)力及相應(yīng)峰值應(yīng)變大小的影響顯著，流變應(yīng)力及峰值應(yīng)變均隨著變形溫度的降低和應(yīng)變速率的增加而增大；在真應(yīng)變?yōu)?.1~0.7時(shí)合金的熱加工圖相似，隨著變形溫度的升高及應(yīng)變速率的降低，能量消耗效率逐漸升高；在應(yīng)變速率為0.01 s−1時(shí)，能量消耗效率達(dá)到峰值，約為41%。
關(guān)鍵字: GH4199合金；熱變形激活能；熱變形方程；熱加工圖
of superalloy GH4199
（1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China;
2. Henan Key Laboratory of Advanced Non-ferrous Metals, Henan University of Science and Technology, Luoyang 471003, China;
3. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;
4. No.63883 Unit of PLA, Luoyang 471000, China）
Abstract:The hot compression deformation behavior of the superalloy GH4199 was investigated on Gleeble−3500 hot simulator at the temperature of 1 050−1 180 ℃, strain rate of 0.1−10 s−1 and maximum true strain value of 0.7. The hot deformation activation energy and hot deformation equation of superalloy GH4199 were obtained, its processing maps were established and explained on the basis of microstructure observation. The results show that under this experimental conditions the superalloy GH4199 shows dynamic recrystallization characteristics during the hot compression deformation. Both the deformation temperature and strain rate have obvious influences on the flow stress and its corresponding peak strain, which increase gradually with decreasing temperature and increasing strain rate. The maps obtained at the true strains of 0.1−0.7 are essentially similar. The efficiency of power dissipation of the superalloy GH4199 increases gradually with increasing temperature and decreasing strain rate. A peak efficiency of power dissipation of about 41% appears at about 0.01 s−1.
Key words: superalloy GH4199; hot deformation activation energy; hot deformation equation; processing maps
