【摘要】：針對耐熱不銹鋼X8CrNi25-21的材料特性,基于彈塑性力學理論和位錯動力學對經(jīng)典的Johnson-Cook(JC)本構模型進行修正,引入位錯塞積理論,并在本構中考慮晶粒尺寸和晶體取向等微觀參數(shù),建立了基于尺度效應的耐熱不銹鋼X8CrNi25-21介觀尺度材料響應行為本構模型.通過采用介觀尺度非標準件,并利用熱處理工藝改變材料的晶粒尺寸,開展準靜態(tài)拉伸實驗、動態(tài)霍普金森壓桿實驗進行介觀尺度材料測試,建立了晶體尺寸與介觀尺度材料塑性變形與斷裂行為特征的變化規(guī)律,并最終確定了耐熱不銹鋼X8CrNi25-21介觀尺度材料本構模型各參數(shù)值.
[Abstract]:According to the material properties of heat-resistant stainless steel X8CrNi25-21, the classical Johnson-Cook (JC) constitutive model is modified based on elastic-plastic mechanics theory and dislocation dynamics, and the dislocation plug product theory is introduced. Considering the microscopic parameters such as grain size and crystal orientation, the response behavior model of heat-resistant stainless steel X8CrNi25-21 mesoscopic material based on scale effect is established. By using mesoscopic non-standard parts and heat treatment process to change the grain size of the material, quasi-static tensile test and dynamic Hopkinson compression bar test were carried out to test the mesoscopic material. The variation of plastic deformation and fracture behavior of mesoscopic materials with crystal size and mesoscopic scale materials was established, and the parameters of the constitutive model of heat-resistant stainless steel X8CrNi25-21 mesoscopic materials were finally determined.
【作者單位】： 北京理工大學先進加工技術國防重點學科實驗室;北京電力設備總廠有限公司;
【基金】：國家自然科學基金資助項目(51375050)
【分類號】：TG142.71

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