锻压技术

3D-SPD制备45钢棒材的热处理工艺

英文标题：Heat treatment process on 45 steel bar prepared by 3D-SPD

作者：王航舵庞玉华孙琦刘东张喆

单位：1.西安建筑科技大学冶金工程学院 2.西安建筑科技大学陕西省冶金工程技术研究中心 3.西北工业大学材料学院

分类号：TG156；TG142.2

出版年,卷(期):页码：2022,47(9):203-210

摘要：

针对单道次剧烈压扭复合3D-SPD轧制获得的45钢Φ25 mm超细晶棒材的塑性发生下降的问题，采用退火、回火、正火及亚温淬火4种热处理方式处理，研究了不同热处理方式对棒材组织及力学性能的影响规律。研究结果表明：回火和退火处理后渗碳体均发生了分布均匀的球化，颗粒尺寸随着温度升高而增大，颗粒尺寸可细化至400 nm；正火处理后，珠光体团的尺寸和片层渗碳体的间距随着温度升高逐渐增大；亚温淬火处理后获得了弥散分布的岛状马氏体组织，马氏体的体积分数随着保温时间的延长逐渐增加。退火、回火以及正火后，材料的塑性均得到了明显的改善，其中，在600 ℃回火后，材料的抗拉强度和伸长率为785 MPa和23.9％，塑性提高约38%，具有最优的强度和塑性匹配效果。

For the problem of plasticity decrease for Φ25 mm ultrafine grained bar of 45 steel obtained by single-pass intense compression-torsion composite 3D-SPD rolling, the influence laws of different heat treatment methods on the microstructure and mechanical properties for bar were investigated by four heat treatment methods of annealing, tempering, normalizing and sub-temperature quenching. The results show that after tempering and annealing, the cementite is spheroidized with uniform distribution, the size of particle increases with the increasing of temperature, and the particle size is refined to 400 nm. After normalizing treatment, the size of pearlite clusters and the spacing of lamellar cementite gradually increase with the increasing of temperature. After sub-temperature quenching treatment, dispersing island martensite structure is obtained, and the volume fraction of martensite gradually increases with prolonging of holding time. After annealing, tempering and normalizing, the plasticity of material is obviously improved, after tempering at 600 ℃, the tensile strength and elongation of material are 785 MPa and 23.9% respectively, and the plasticity is increased by about 38%, which shows the best matching effect between strength and plasticity.

基金项目：

陕西省重点研发计划项目（2020GY-253）

作者简介：王航舵（1996-），男，硕士研究生 E-mail：1651786202@qq.com 通信作者：庞玉华（1965-），女，博士，教授 E-mail：pyhyyl@126.com

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