(1. 沈陽工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，沈陽 110870；
2. 北京航空材料研究院 先進(jìn)高溫結(jié)構(gòu)材料國防科技重點(diǎn)實(shí)驗(yàn)室，北京 100095)
摘 要: 通過對(duì)FGH95合金進(jìn)行不同溫度的熱等靜壓處理、組織形貌觀察及持久性能測試，研究熱等靜壓溫度對(duì)合金組織結(jié)構(gòu)與持久性能的影響。結(jié)果表明：在低于γ′ 相溶解溫度進(jìn)行熱等靜壓時(shí)，粗大γ′ 相沿顆粒邊界區(qū)域不連續(xù)分布；隨熱等靜壓溫度的升高，合金中一次粗大γ′ 相的數(shù)量、尺寸逐漸減小，經(jīng)1 140 ℃固溶處理后，晶粒尺寸無明顯變化；合金經(jīng)1 180 ℃熱等靜壓及完全熱處理后，粗大γ′ 相完全溶解及γ′ 相貧化區(qū)消失，晶粒尺寸明顯長大，γ′ 相和細(xì)小碳化物沿晶界及晶內(nèi)彌散析出，因而合金具有較好的持久性能；合金在持久性能測試期間的變形機(jī)制是位錯(cuò)在基體中滑移及剪切γ′ 相。
關(guān)鍵字: FGH95合金；熱等靜壓；組織形貌；持久性能；變形機(jī)制
microstructure and stress rupture properties of FGH95 superalloy
（1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;
2. National Key Laboratory of Advanced High Temperature Structural Materials,
Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:By means of the hot isostatic pressing treatment (HIP) at the different temperatures, microstructure observation and stress rupture properties measurement, the influence of HIP temperatures on the microstructure and enduring properties of FGH95 nickel-base superalloy were investigated. The results show that, when the HIP temperature is lower than γ′ phase dissolving temperature, coarser γ′ phase discontinuously distributes in the particle boundary regions and the quantity and size of coarser γ′ precipitates decrease gradually as the HIP temperature increasing. No feature of the grain growing up is detected after the alloy is solution treated at 1 140 ℃, and the carbide particles distribute along the grain boundary and in the grain. After HIP-treated at 1 180 ℃ and fully heat treated, the coarser γ′ phase in the alloy is dissolved, the depleted zone of the fine γ′ phase disappears, and the grain size in the alloy obviously increases, and the γ′ phase and fine carbide are dispersedly precipitated within the grains and boundaries, which enhances the enduring properties of the alloy. The deformation mechanisms of the alloy during endurance properties testing are that the dislocations slip in the matrix or shear into γ′ phase.
Key words: FGH95 superalloy; hot isostatic pressing; microstructure; enduring properties; deformation mechanism
