Single-pass and double-pass high-temperature deformation experiments were conducted on 40Cr10Si2Mo steel using a Gleeble-3500 thermal simulator.The static recrystallization(SRX)behavior and recrystallization mechanism...Single-pass and double-pass high-temperature deformation experiments were conducted on 40Cr10Si2Mo steel using a Gleeble-3500 thermal simulator.The static recrystallization(SRX)behavior and recrystallization mechanisms of 40Cr10Si2Mo steel were investigated under deformation temperatures of 900-1100℃,deformation strains of 10%,20%,and 30%,and inter-pass times of 1-120 s.A static recrystallization fraction model was developed.The results showed that the SRX volume fraction increased with higher deformation temperature,larger deformation amount,and longer inter-pass time,with the deformation temperature having the most significant effect on SRX.During the deformation process,different process parameters led to different internal deformation mechanisms of the material.Static recovery and continuous static recrystallization(CSRX)dominated deformation at lower temperatures through progressive lattice rotation.In comparison,at higher temperatures,the deformation mechanism was dominated by CSRX and discontinuous static recrystallization(DSRX).The nucleation mechanisms of the SRX process were grain boundary bulging nucleation and subgrain merging nucleation,with grain boundary bulging present under all conditions.Subgrain merging nucleation could provide an additional nucleation mode at lower deformation temperatures or lower deformation amounts.Based on the traditional Avarmi equation,a modified model coefficient was used to establish the SRX kinetic model for 40Cr10Si2Mo steel.The linear correlation coefficient R^(2) between the predicted and experimental static recrystallization volume fraction was 0.96702,indicating high prediction accuracy.展开更多
为了建立W9Cr4V2Mo钢奥氏体化工艺与碳化物、晶粒之间的联系,采用光学显微镜(OM)、扫描电子显微镜(SEM)、激光共聚焦显微镜(LSCM)等表征技术,结合热力学计算与Image-Pro Plus 6.0图像分析软件,研究了不同奥氏体化温度(1140~1240℃)及不...为了建立W9Cr4V2Mo钢奥氏体化工艺与碳化物、晶粒之间的联系,采用光学显微镜(OM)、扫描电子显微镜(SEM)、激光共聚焦显微镜(LSCM)等表征技术,结合热力学计算与Image-Pro Plus 6.0图像分析软件,研究了不同奥氏体化温度(1140~1240℃)及不同保温时间(5~20h)对高碳高合金W9Cr4V2Mo钢碳化物溶解及晶粒长大规律的影响。结果表明,在高温均质化过程中,随着均质化温度的升高,M6C型碳化物优先溶解,MC型碳化物随后溶解。随着均质化温度以及保温时间的升高,碳化物面积分数有减少的趋势。在碳化物回溶过程中,其表面曲率会持续变化,碳化物的棱角性指标也随之波动。当温度超过1200℃时,材料中会出现混晶现象。此外,本研究通过统计测定不同奥氏体化温度与保温时间下的晶粒尺寸及碳化物特征参数,采用阿伦尼乌斯型公式对奥氏体晶粒长大行为进行拟合,并综合考量奥氏体化温度与保温时间的影响,得到了在该范围内(1140~1240℃,5~20h)适用于W9Cr4V2Mo钢的晶粒长大动力学模型。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.52174371)the National Key Research and Development Program of China(Grant No.2021YFB3501003)the Shaanxi Provincial Science and Technology Department Enterprise Joint Fund(Grant No.2021JLM-33).
文摘Single-pass and double-pass high-temperature deformation experiments were conducted on 40Cr10Si2Mo steel using a Gleeble-3500 thermal simulator.The static recrystallization(SRX)behavior and recrystallization mechanisms of 40Cr10Si2Mo steel were investigated under deformation temperatures of 900-1100℃,deformation strains of 10%,20%,and 30%,and inter-pass times of 1-120 s.A static recrystallization fraction model was developed.The results showed that the SRX volume fraction increased with higher deformation temperature,larger deformation amount,and longer inter-pass time,with the deformation temperature having the most significant effect on SRX.During the deformation process,different process parameters led to different internal deformation mechanisms of the material.Static recovery and continuous static recrystallization(CSRX)dominated deformation at lower temperatures through progressive lattice rotation.In comparison,at higher temperatures,the deformation mechanism was dominated by CSRX and discontinuous static recrystallization(DSRX).The nucleation mechanisms of the SRX process were grain boundary bulging nucleation and subgrain merging nucleation,with grain boundary bulging present under all conditions.Subgrain merging nucleation could provide an additional nucleation mode at lower deformation temperatures or lower deformation amounts.Based on the traditional Avarmi equation,a modified model coefficient was used to establish the SRX kinetic model for 40Cr10Si2Mo steel.The linear correlation coefficient R^(2) between the predicted and experimental static recrystallization volume fraction was 0.96702,indicating high prediction accuracy.
文摘为了建立W9Cr4V2Mo钢奥氏体化工艺与碳化物、晶粒之间的联系,采用光学显微镜(OM)、扫描电子显微镜(SEM)、激光共聚焦显微镜(LSCM)等表征技术,结合热力学计算与Image-Pro Plus 6.0图像分析软件,研究了不同奥氏体化温度(1140~1240℃)及不同保温时间(5~20h)对高碳高合金W9Cr4V2Mo钢碳化物溶解及晶粒长大规律的影响。结果表明,在高温均质化过程中,随着均质化温度的升高,M6C型碳化物优先溶解,MC型碳化物随后溶解。随着均质化温度以及保温时间的升高,碳化物面积分数有减少的趋势。在碳化物回溶过程中,其表面曲率会持续变化,碳化物的棱角性指标也随之波动。当温度超过1200℃时,材料中会出现混晶现象。此外,本研究通过统计测定不同奥氏体化温度与保温时间下的晶粒尺寸及碳化物特征参数,采用阿伦尼乌斯型公式对奥氏体晶粒长大行为进行拟合,并综合考量奥氏体化温度与保温时间的影响,得到了在该范围内(1140~1240℃,5~20h)适用于W9Cr4V2Mo钢的晶粒长大动力学模型。
