锻压技术

20MnMoB结构钢调质冷锻后硬度变化规律分析

英文标题：Analysis on hardness variation of structural steel 20MnMoB for cold forging after quenching and tempering

作者：姚源镠胡成亮赵震龚爱军施卫兵

单位：1. 上海交通大学模具CAD国家工程研究中心上海 200030 2. 江苏森威精锻有限公司江苏大丰 224100

分类号：TG376.3

出版年,卷(期):页码：2019,44(5):131-135

摘要：

以20MnMoB结构钢调质后直接冷锻工艺为研究对象，对4种不同调质处理工艺下的圆柱试样分别进行不同变形程度的压缩实验，通过有限元模拟、X射线衍射法和电子背散射衍射技术分别获得锻件的等效应变值、位错密度以及初始晶粒尺寸，结合对应位置维氏硬度实测值大小，分析这3个因素对于冷锻件硬度的变化规律影响。结果表明，硬度与这3个影响因素关系密切，硬度随着等效应变与位错密度的增加而增大，随着晶粒尺寸的增大而减小。所得硬度值的具体数据为构建硬度预测模型奠定了基础。

For the cold forging process of structural steel 20MnMoB after quenching and tempering, a series of compressive tests for cylindrical specimens which were processed by different quenching and tempering technologies were conducted under different deformation degrees, and the equivalent strain, dislocation density and initial grain size of forgings were obtained respectively by finite elements simulation, Xray diffraction (XRD) and electron backscattered diffraction (EBSD). Combining with the measured values of Vickers hardness at the corresponding positions, the influences of three factors on the hardness of cold forgings were investigated and analyzed. The results show that the hardness is closely related to the three factors, and the hardness increases with the increasing of equivalent strain and dislocation density and decreases with the increasing of grain size. Thus, the specific data of hardness values can be applied to the construction of hardness prediction model.

基金项目：

国家自然科学基金资助项目（51475294）

作者简介：姚源镠（1994-），男，硕士研究生 Email：yuanliuyao@foxmail.com 通讯作者：胡成亮（1980-），男，博士，研究员 Email：clhu@sjtu.edu.cn

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