塑性工程学报
塑性工程學報
소성공정학보
JOURNAL OF PLASTICITY ENGINEERING
2014年
2期
32-39
,共8页
胡琳琳%郭良刚%杨合%李永堂
鬍琳琳%郭良剛%楊閤%李永堂
호림림%곽량강%양합%리영당
环件铸辗复合成形%环件径轴向轧制%坯料尺寸%组织演变
環件鑄輾複閤成形%環件徑軸嚮軋製%坯料呎吋%組織縯變
배건주전복합성형%배건경축향알제%배료척촌%조직연변
combined casting-rolling of ring parts%radial-axial ring rolling%blank size%structure evolution
基于铸坯的环件径轴向辗轧成形新技术面临的瓶颈问题,对坯料铸态组织的演变规律与合理控制进行研究。对某环件双向轧制,铸坯的尺寸将决定变形程度和径、轴向的变形量分配,从而对最终环件的组织起着至关重要的作用。该文基于ABAQUS平台,建立了42CrMo钢铸坯环件径轴向热辗轧宏微观耦合有限元模型;采用一种基于轧比 K和径轴向变形量分配比tanα的坯料尺寸设计方法,针对同一环件的轧制过程,设计具有不同 K和tanα值的不同尺寸的多个环坯,模拟不同铸态42CrMo坯料尺寸下环件径轴向辗轧过程组织的演变规律。结果表明,随着 K值增大,环件动态再结晶程度增加,平均晶粒尺寸减小且分布逐渐均匀;随着 tanα值增大,环件上下端面区域动态再结晶程度增大,平均晶粒尺寸减小,沿环件轴向平均晶粒尺寸分布逐渐不均匀,而内外表面区域动态再结晶程度减小,平均晶粒尺寸增大,沿环件径向平均晶粒尺寸分布逐渐均匀。
基于鑄坯的環件徑軸嚮輾軋成形新技術麵臨的瓶頸問題,對坯料鑄態組織的縯變規律與閤理控製進行研究。對某環件雙嚮軋製,鑄坯的呎吋將決定變形程度和徑、軸嚮的變形量分配,從而對最終環件的組織起著至關重要的作用。該文基于ABAQUS平檯,建立瞭42CrMo鋼鑄坯環件徑軸嚮熱輾軋宏微觀耦閤有限元模型;採用一種基于軋比 K和徑軸嚮變形量分配比tanα的坯料呎吋設計方法,針對同一環件的軋製過程,設計具有不同 K和tanα值的不同呎吋的多箇環坯,模擬不同鑄態42CrMo坯料呎吋下環件徑軸嚮輾軋過程組織的縯變規律。結果錶明,隨著 K值增大,環件動態再結晶程度增加,平均晶粒呎吋減小且分佈逐漸均勻;隨著 tanα值增大,環件上下耑麵區域動態再結晶程度增大,平均晶粒呎吋減小,沿環件軸嚮平均晶粒呎吋分佈逐漸不均勻,而內外錶麵區域動態再結晶程度減小,平均晶粒呎吋增大,沿環件徑嚮平均晶粒呎吋分佈逐漸均勻。
기우주배적배건경축향전알성형신기술면림적병경문제,대배료주태조직적연변규률여합리공제진행연구。대모배건쌍향알제,주배적척촌장결정변형정도화경、축향적변형량분배,종이대최종배건적조직기착지관중요적작용。해문기우ABAQUS평태,건립료42CrMo강주배배건경축향열전알굉미관우합유한원모형;채용일충기우알비 K화경축향변형량분배비tanα적배료척촌설계방법,침대동일배건적알제과정,설계구유불동 K화tanα치적불동척촌적다개배배,모의불동주태42CrMo배료척촌하배건경축향전알과정조직적연변규률。결과표명,수착 K치증대,배건동태재결정정도증가,평균정립척촌감소차분포축점균균;수착 tanα치증대,배건상하단면구역동태재결정정도증대,평균정립척촌감소,연배건축향평균정립척촌분포축점불균균,이내외표면구역동태재결정정도감소,평균정립척촌증대,연배건경향평균정립척촌분포축점균균。
Based on the main bottleneck question for the development of the new technology of radial-axial ring rolling based on in-got blank , the evolution rules and reasonable control of the cast microstructure of the blank have been studied . For the bidirec-tional rolling of a certain ring part , the blank size determines the deformation degree and the distribution of reductions along radial and axial directions ,thus it plays a crucial role on the final structure of the rolled ring .In this paper ,we first established a cou-pled macro-micro FE model of radial-axial ring rolling process based on 42CrMo ingot blank under ABAQUS software environ-ment ,then designed multiple ring blanks for an identical ring part using a blank sizes design method based on rolling ratio (K) and the ratio of deformations (tanα) in the radial and axial directions ,and lastly numerically revealed the evolution rules of micro-structure during radial-axial ring rolling process under different blank sizes . The results demonstrate that :1) with the increase of K ,the recrystallization percentages increase , the average grain sizes decrease and distribute more uniformly ;2) with the in-crease of tanα, the average grain sizes decrease in the ring top and bottom regions with increased recrystallization percentages , and distribute more unevenly along the axial direction ;while in the inside and outside region , the average grain sizes increase and distribute more uniformly along the radial direction .