炮钢材料等离子淬火后动态力学性能研究

为提高炮钢材料在较高冲击作用下的动态力学性能,采用等离子淬火技术对炮钢材料进行表面处理,并使用分离式霍普金森压杆(SHPB)系统对原始炮钢材料与等离子淬火后的炮钢材料进行对比分析,方法为对两种试样在试验前后的长度压缩量以及二者在不同应变率下的动态应力-应变曲线进行比较。结果表明,随着应变率的增加两种试样的应力-应变关系、屈服强度都有不同程度的强化效应,都表现出一定的应变率敏感性;在相同气压下两种试样在长度方向上都产生了一定的塑性变形,但淬火试样的压缩量明显小于原始试样。并且气压相同时试样经过等离子淬火后其抗冲击性能有显著提升,具体表现为应变与应变率降低,屈服强度与极限强度升高。

Experimental study on dynamic mechanical properties of gun steel materials after plasma quenching

In order to improve the dynamic mechanical properties of gun steel materials under high impact,plasma quenching technology is used for surface treatment.The comparison of the original gun steel materials with the plasma quenched materials is carried out by the split Hopkinson pressure bar(SHPB)system.The length compression of two samples before and after the tests and the dynamic stress-strain curves of the two samples under different strain rates are compared.The results show that the stress-strain relationship and yield strength of two samples have different degrees of strengthening effect with the increase of strain rate,implying a certain strain rate sensitivity.Both samples have certain plastic deformations in the longitudinal direction under the same air pressure,but the compression amount of the quenched sample is significantly smaller than that of the original sample.When the pressure is the same,the impact resistance of the sample after plasma quenching is significantly improved,which can be characterized by the decrease of strain and strain rate,and the increase of yield strength and ultimate strength.