Transactions of Materials and Heat Treatment

Title：Heat treatment process on 45 steel bar prepared by 3D-SPD

Authors： Wang Hangduo1 2 Pang Yuhua1 2 Sun Qi1 2 Liu Dong3 Zhang Zhe3

Unit： 1. School of Metallurgical Engineering Xi′an University of Architecture and Technology 2. Shaanxi Metallurgical Engineering Technology Research Center Xi′an University of Architecture and Technology 3. School of Materials Science and Engineering Northwestern Polytechnic University

KeyWords： compression-torsion composite deformation ultrafine grain heat treatment microstructure mechanical properties

ClassificationCode：TG156；TG142.2

year,vol(issue):pagenumber：2022,47(9):203-210

Abstract：

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.

Funds：

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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