本文選題：粉末高溫合金 + 熱變形　； 參考：《金屬學(xué)報(bào)》2017年11期

【摘要】：采用單軸熱壓縮實(shí)驗(yàn),研究了熱等靜壓態(tài)鎳基粉末高溫合金FGH98的熱加工變形行為。觀察了形變過(guò)程中的合金組織演變,分析了顯微組織不穩(wěn)定性對(duì)熱塑性的影響。熱壓縮實(shí)驗(yàn)在等溫、恒應(yīng)變速率下進(jìn)行,真應(yīng)變分別為0.2、0.4和0.6,溫度分別為1060、1105、1138和1165℃,應(yīng)變速率分別為0.01、0.1、1和10 s-1。結(jié)果表明,隨著真應(yīng)變的增加,合金的真應(yīng)力-真應(yīng)變曲線上出現(xiàn)硬化-軟化-穩(wěn)態(tài)流變階段。在低于g′相完全溶解溫度、合金處在穩(wěn)態(tài)流變或高應(yīng)變條件下時(shí),發(fā)生應(yīng)變誘發(fā)動(dòng)態(tài)再結(jié)晶并形成特殊形態(tài)的g+g′顯微雙相晶粒組織。晶粒尺寸細(xì)小,達(dá)到1.2~6.8μm,合金顯示良好的熱塑性。分析了變形過(guò)程中晶粒尺寸和流變應(yīng)力的變化和g+g′顯微雙相晶粒組織形成機(jī)理,并對(duì)熱加工過(guò)程中顯微組織調(diào)控的可能性進(jìn)行討論。
[Abstract]:The hot working deformation behavior of hot isostatic nickel base superalloy (FGH98) was studied by uniaxial compression test. The microstructure evolution during deformation was observed and the effect of microstructure instability on thermoplasticity was analyzed. The thermal compression experiments were carried out at isothermal and constant strain rates. The true strain was 0.20.4,0.6, the temperature was 1060,1105U 1138 and 1165 鈩，

本文編號(hào)：1861802