【摘要】：針對耐熱不銹鋼X8CrNi25-21的材料特性,基于彈塑性力學(xué)理論和位錯(cuò)動力學(xué)對經(jīng)典的Johnson-Cook(JC)本構(gòu)模型進(jìn)行修正,引入位錯(cuò)塞積理論,并在本構(gòu)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(yīng)的耐熱不銹鋼X8CrNi25-21介觀尺度材料響應(yīng)行為本構(gòu)模型.通過采用介觀尺度非標(biāo)準(zhǔn)件,并利用熱處理工藝改變材料的晶粒尺寸,開展準(zhǔn)靜態(tài)拉伸實(shí)驗(yàn)、動態(tài)霍普金森壓桿實(shí)驗(yàn)進(jìn)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(gòu)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(xué)先進(jìn)加工技術(shù)國防重點(diǎn)學(xué)科實(shí)驗(yàn)室;北京電力設(shè)備總廠有限公司;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51375050)
【分類號】：TG142.71

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