塑性工程学报
塑性工程學報
소성공정학보
JOURNAL OF PLASTICITY ENGINEERING
2009年
6期
39-44
,共6页
挤压%镍基耐蚀合金%耗散效率%热加工图
擠壓%鎳基耐蝕閤金%耗散效率%熱加工圖
제압%얼기내식합금%모산효솔%열가공도
extrusion%Ni-based superalloy%efficiency of power dissipation%processing maps
在Gleeble-3500热模拟试验机上,利用热压缩变形研究了镍基耐蚀合金inconel 690的热变形特性,温度为1100℃~1250℃、应变速率为1.0s~(-1)~60s~(-1),建立inconel 690的热变形本构方程,在计算功率耗散效率的基础上,使用动态模型理论,绘制了inconel 690的热加工图,其热激活能约465kJ/mol,在应变0.34~0.8内,inconel 690的热加工图是相似的,热加工图表明,计算耗散功率系数有两个峰值区,为1130℃ and 60s~(-1) 及1250℃ and 1.0s~(-1);功率耗散效率值为36%~50%,两区域变形试件的金相观察表明,镍基耐蚀合金inconel 690发生动态再结晶,晶粒细小均匀.
在Gleeble-3500熱模擬試驗機上,利用熱壓縮變形研究瞭鎳基耐蝕閤金inconel 690的熱變形特性,溫度為1100℃~1250℃、應變速率為1.0s~(-1)~60s~(-1),建立inconel 690的熱變形本構方程,在計算功率耗散效率的基礎上,使用動態模型理論,繪製瞭inconel 690的熱加工圖,其熱激活能約465kJ/mol,在應變0.34~0.8內,inconel 690的熱加工圖是相似的,熱加工圖錶明,計算耗散功率繫數有兩箇峰值區,為1130℃ and 60s~(-1) 及1250℃ and 1.0s~(-1);功率耗散效率值為36%~50%,兩區域變形試件的金相觀察錶明,鎳基耐蝕閤金inconel 690髮生動態再結晶,晶粒細小均勻.
재Gleeble-3500열모의시험궤상,이용열압축변형연구료얼기내식합금inconel 690적열변형특성,온도위1100℃~1250℃、응변속솔위1.0s~(-1)~60s~(-1),건립inconel 690적열변형본구방정,재계산공솔모산효솔적기출상,사용동태모형이론,회제료inconel 690적열가공도,기열격활능약465kJ/mol,재응변0.34~0.8내,inconel 690적열가공도시상사적,열가공도표명,계산모산공솔계수유량개봉치구,위1130℃ and 60s~(-1) 급1250℃ and 1.0s~(-1);공솔모산효솔치위36%~50%,량구역변형시건적금상관찰표명,얼기내식합금inconel 690발생동태재결정,정립세소균균.
The hot deformation characteristics of Ni-based superalloy-inconel 690 are studied at the temperature 1100℃~1250℃ and the strain rate 1.0s~(-1)~60s~(-1) in hot compression tests.Processing maps for hot working are developed based on the calculating dissipation efficiency of power with a dynamic theoretical model used.A hot deformation equation is given to characterize the dependence of peak stress on the temperature and strain rate.The activation energy of the material under hot deformation is about 465kJ/mol.The processing maps obtained within the strain range 0.34~0.8 are similar.The maps show that the coefficient of the calculating dissipation power reach its peak value around 1130℃/60s~(-1) and 1250℃/1.0s~(-1) with the peak efficiency about 36%~50%.On the basis of micro-structural observation,the region fully recrystallized in the processing map can be identified in accordance with the strain value about 0.7.