Two-dimensional rigid-plastic finite element method (FEM) was used for simulation of the effect of process parameterson the static recrystallization of 60SiMnA spring steel using MARC/AutoForge 3.1 software. A thermo-...Two-dimensional rigid-plastic finite element method (FEM) was used for simulation of the effect of process parameterson the static recrystallization of 60SiMnA spring steel using MARC/AutoForge 3.1 software. A thermo-mechanicalcoupled analysis was conducted considering the heat transfer between the workpiece, the roll and the environment,and the heat generation due to plastic work. The static recrystallization laws under different processing conditionsand the predicted distribution of the static recrystallization volume fraction on the deformation cross section arepresented.展开更多
Φ8.0 mm 60Si2MnA热轧线材拉拔过程中有时出现频繁断丝。在其他化学成分变化较小,Mo质量分数分别为0.082%,0.078%,0.026%,0.005%时,前3种热轧线材显微组织中出现马氏体、贝氏体等异常组织。在850℃加热、保温15 min后,分别采用空冷、...Φ8.0 mm 60Si2MnA热轧线材拉拔过程中有时出现频繁断丝。在其他化学成分变化较小,Mo质量分数分别为0.082%,0.078%,0.026%,0.005%时,前3种热轧线材显微组织中出现马氏体、贝氏体等异常组织。在850℃加热、保温15 min后,分别采用空冷、炉冷和油冷的工艺条件下,Mo质量分数分别为0.082%,0.078%的2个炉号试样直接空冷时,显微组织中出现异常组织,镶嵌后空冷,显微组织正常;Mo质量分数分别为0.026%,0.005%的2个炉号试样无论是直接空冷还是镶嵌后空冷,显微组织均正常。炉冷后,4个炉号试样的显微组织均正常;油冷后,4个炉号试样的显微组织均为正常的淬火组织马氏体加少量残余奥氏体。展开更多
3.80 mm 60Si2MnA淬回火弹簧钢丝抗拉强度出现异常。对力学性能出现严重不均的3.80 mm 60Si2MnA淬回火弹簧钢丝抗拉强度和断面收缩率进行分析,对3.80 mm 60Si2MnA弹簧钢丝微观组织和显微硬度进行比较。结果表明,3.80 mm 60Si2MnA弹簧钢...3.80 mm 60Si2MnA淬回火弹簧钢丝抗拉强度出现异常。对力学性能出现严重不均的3.80 mm 60Si2MnA淬回火弹簧钢丝抗拉强度和断面收缩率进行分析,对3.80 mm 60Si2MnA弹簧钢丝微观组织和显微硬度进行比较。结果表明,3.80 mm 60Si2MnA弹簧钢丝淬回火后出现力学性能严重不均的原因有3个:奥氏体化炉中段炉温异常下降使奥氏体均匀化无法顺利完成;6.5 mm 60Si2MnA热轧线材心部存在严重偏析;奥氏体化炉横向温度分布均匀性较差。展开更多
The 3-D thermo-mechanical coupled elasto-plastic finite element method (FEM)was used for the simulation of the two-pass continuous hot rolling process of 60SiMnA spring steelbars and rods using MARC/AutoForge3.1 softw...The 3-D thermo-mechanical coupled elasto-plastic finite element method (FEM)was used for the simulation of the two-pass continuous hot rolling process of 60SiMnA spring steelbars and rods using MARC/AutoForge3.1 software. The simulated results visualize the metal flow andthe dynamic evolutions of the strain, stress and temperature during the continuous hot rolling,especially inside the work-piece. It is shown that the non-uniform distributions of the strain,stress and temperature on the longitudinal and transverse sections are a distinct characteristic ofthe continuous hot rolling, which can be used as basic data for improving the tool design,predicting and controlling the micro-structural evolution of a bar and rod.展开更多
文摘Two-dimensional rigid-plastic finite element method (FEM) was used for simulation of the effect of process parameterson the static recrystallization of 60SiMnA spring steel using MARC/AutoForge 3.1 software. A thermo-mechanicalcoupled analysis was conducted considering the heat transfer between the workpiece, the roll and the environment,and the heat generation due to plastic work. The static recrystallization laws under different processing conditionsand the predicted distribution of the static recrystallization volume fraction on the deformation cross section arepresented.
文摘Φ8.0 mm 60Si2MnA热轧线材拉拔过程中有时出现频繁断丝。在其他化学成分变化较小,Mo质量分数分别为0.082%,0.078%,0.026%,0.005%时,前3种热轧线材显微组织中出现马氏体、贝氏体等异常组织。在850℃加热、保温15 min后,分别采用空冷、炉冷和油冷的工艺条件下,Mo质量分数分别为0.082%,0.078%的2个炉号试样直接空冷时,显微组织中出现异常组织,镶嵌后空冷,显微组织正常;Mo质量分数分别为0.026%,0.005%的2个炉号试样无论是直接空冷还是镶嵌后空冷,显微组织均正常。炉冷后,4个炉号试样的显微组织均正常;油冷后,4个炉号试样的显微组织均为正常的淬火组织马氏体加少量残余奥氏体。
文摘3.80 mm 60Si2MnA淬回火弹簧钢丝抗拉强度出现异常。对力学性能出现严重不均的3.80 mm 60Si2MnA淬回火弹簧钢丝抗拉强度和断面收缩率进行分析,对3.80 mm 60Si2MnA弹簧钢丝微观组织和显微硬度进行比较。结果表明,3.80 mm 60Si2MnA弹簧钢丝淬回火后出现力学性能严重不均的原因有3个:奥氏体化炉中段炉温异常下降使奥氏体均匀化无法顺利完成;6.5 mm 60Si2MnA热轧线材心部存在严重偏析;奥氏体化炉横向温度分布均匀性较差。
文摘The 3-D thermo-mechanical coupled elasto-plastic finite element method (FEM)was used for the simulation of the two-pass continuous hot rolling process of 60SiMnA spring steelbars and rods using MARC/AutoForge3.1 software. The simulated results visualize the metal flow andthe dynamic evolutions of the strain, stress and temperature during the continuous hot rolling,especially inside the work-piece. It is shown that the non-uniform distributions of the strain,stress and temperature on the longitudinal and transverse sections are a distinct characteristic ofthe continuous hot rolling, which can be used as basic data for improving the tool design,predicting and controlling the micro-structural evolution of a bar and rod.
