【摘要】：基于熱壓縮實(shí)驗(yàn)得到的數(shù)據(jù),獲得了45Cr4NiMoV合金在改進(jìn)的Laasraoui-Jonas(L-J)位錯(cuò)密度模型中的應(yīng)變軟化參數(shù)及應(yīng)變硬化參數(shù),建立了45Cr4NiMoV合金的動態(tài)再結(jié)晶模型。采用元胞自動機(jī)(CA)方法,應(yīng)用DEFORM-3D軟件對45Cr4NiMoV合金熱成形過程中的動態(tài)再結(jié)晶行為進(jìn)行有限元分析,并與實(shí)驗(yàn)得到的微觀組織進(jìn)行對比。結(jié)果表明:當(dāng)應(yīng)變速率及變形量一定時(shí),較高的變形溫度促使45Cr4NiMoV合金位錯(cuò)及晶界遷移運(yùn)動加劇,其動態(tài)再結(jié)晶晶粒尺寸隨著變形溫度的升高而增大,模擬結(jié)果與實(shí)驗(yàn)結(jié)果較為吻合,驗(yàn)證了所建立的L-J位錯(cuò)密度模型的合理性,說明修正的L-J位錯(cuò)密度模型結(jié)合CA能準(zhǔn)確預(yù)測45Cr4NiMoV合金的動態(tài)再結(jié)晶微觀組織演變過程。
[Abstract]:The strain softening parameters and strain hardening parameters of 45Cr4NiMoV alloy in the modified Laasraoui-Jonas (L-J) dislocation density model were obtained based on the data obtained from thermal compression experiments. The dynamic recrystallization model of 45Cr4NiMoV alloy was established. The dynamic recrystallization behavior of 45Cr4NiMoV alloy during hot forming was analyzed by means of cellular automata (CA) method and DEFORM-3D software, and the microstructure was compared with the experimental results. The results show that when the strain rate and deformation amount are constant, the higher deformation temperature makes the dislocation and grain boundary migration of 45Cr4NiMoV alloy increase, and the dynamic recrystallization grain size increases with the increase of deformation temperature. The simulation results are in good agreement with the experimental results, which verifies the rationality of the proposed L-J dislocation density model, which indicates that the modified L-J dislocation density model combined with CA can accurately predict the dynamic recrystallization microstructure evolution of 45Cr4NiMoV alloys.
【作者單位】： 河南科技大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金(51575162)
【分類號】：TG142.1

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