Effect of Quenching Conditions on the Microstructure and Mechanical Properties of 51CrV4 Spring Steel
Effect of Quenching Conditions on the Microstructure and Mechanical Properties of 51CrV4 Spring Steel
复制标题
淬火条件对51CrV4弹簧钢显微组织和力学性能的影响
DOI：
10.3390/met8121056
复制
发表时间：
2018-12
期刊：
影响因子：
2.9
通讯作者：
Wang Engang
中科院分区：
文献类型：
--
作者：
Zhang Lin;Gong Dehai;Li Yunchao;Wang Xiaojun;Ren Xixi;Wang Engang
51 CrV 4钢广泛用于火车和车辆的大型阻尼弹簧。淬火条件在性能提高中起重要作用。研究了不同油浴温度和离油温度对该钢组织和力学性能的影响。形态学检查集中于淬火马氏体和回火屈挠体两者。进行拉伸和硬度测试以评估机械性能。结果表明，在较高的油浴温度下，马氏体发生粗化。此外，贝氏体岛的尺寸和比例也随着油浴温度的升高而增加。相反，随着油浴温度的升高，碳化物尺寸和碳化物间距均增大。因此，拉伸强度和硬度都随着油浴温度的升高而降低，符合Hall-Petch关系。相应地，延展性随着油浴温度的升高而增加。在较高的出油温度下，马氏体发生了自回火过程，导致许多细小的碳化物颗粒在淬火马氏体板条中析出。这种自回火效应增加了最终组织中大尺寸碳化物的宽度并减少了它们的长度。碳化物间距随离油温度的升高而增大。随着油浴温度的升高，抗拉强度和硬度降低，塑性提高。对断口形貌进行了分析，以解释力学性能的结果。
51CrV4 steel is extensively used in large-size damping springs for trains and vehicles. Quenching conditions play an important role in performance enhancement. The present work investigated the effects of various oil-bath temperatures and out-of-oil temperatures on the microstructure and the mechanical properties of this steel. The morphological examination focused on both the quenched martensite and the tempered troostite. Tensile and hardness tests were carried out to evaluate the mechanical properties. The results showed that a coarsening of the martensite occurred at a high oil-bath temperature. In addition, the size and fraction of bainite islands also increased with the increase of oil-bath temperature. In contrast, the carbide size and the intercarbide spacing both increased with the increase of oil-bath temperature. Thus, the tensile strength and the hardness both decreased with increasing oil-bath temperature in accordance with the Hall-Petch relationship. Correspondingly, the ductility increased as the oil-bath temperature increased. At a relatively high out-of-oil temperature, the martensite underwent an auto-tempering process, which led to the precipitation of many tiny carbide particles in the as-quenched martensite laths. This auto-tempering effect enhanced the width of large-sized carbides and reduced their length in the final microstructure. The intercarbide spacings increased with increasing out-of-oil temperature. As the oil-bath temperature increased, the tensile strength and hardness decreased, and the ductility increased. The fracture morphology was examined to explain the results of mechanical properties.
登录
查看更多内容
影响因子：
4
作者：
A. Bytyqi;M. Jenko;M. Godec
通讯作者：
A. Bytyqi;M. Jenko;M. Godec
影响因子：
4
作者：
Le Xu;Liang Chen;Wei Sun
通讯作者：
Le Xu;Liang Chen;Wei Sun
DOI：
10.1016/j.calphad.2016.03.001
发表时间：
2016-06-01
影响因子：
2.4
作者：
Hou, Ziyong;Hedstrom, Peter;Odqvist, Joakim
通讯作者：
Odqvist, Joakim
影响因子：
0.6
作者：
Liu Shiyong;Li Deyi;Liu Shicheng
通讯作者：
Liu Shiyong;Li Deyi;Liu Shicheng
DOI：
10.1016/0001-6160(88)90008-9
发表时间：
1988-02-01
期刊：
ACTA METALLURGICA
影响因子：
--
作者：
DOLLAR, M;BERNSTEIN, IM;THOMPSON, AW
通讯作者：
THOMPSON, AW