CAJ | 학술논문

目的在1.2344钢表面获得一层硬度较高的强化层。方法利用强流脉冲电子束技术，在相同的加速电压下，采用不同的脉冲次数对1.2344钢表面进行改性处理，研究处理前后样品的表层显微组织和性能变化规律。结果经强流脉冲电子束处理后，试样表面形成了形状各异、大小不一、分布不均的熔坑，并且随着脉冲次数的增加，熔坑数量逐渐减少，熔坑的直径变大。当脉冲次数大于50次时，试样表面出现奥氏体相，表面显微硬度提高了14.5%。结论强流脉冲电子束处理可使试样表层的晶粒变小，晶粒细化和表面宏观残余应力的共同作用促使试样显微硬度增加。
목적재1.2344강표면획득일층경도교고적강화층。방법이용강류맥충전자속기술，재상동적가속전압하，채용불동적맥충차수대1.2344강표면진행개성처리，연구처리전후양품적표층현미조직화성능변화규률。결과경강류맥충전자속처리후，시양표면형성료형상각이、대소불일、분포불균적용갱，병차수착맥충차수적증가，용갱수량축점감소，용갱적직경변대。당맥충차수대우50차시，시양표면출현오씨체상，표면현미경도제고료14.5%。결론강류맥충전자속처리가사시양표층적정립변소，정립세화화표면굉관잔여응력적공동작용촉사시양현미경도증가。
ABSTRACT:Objective To obtain a strengthened layer with high hardness on the surface of 1. 2344 steel. Methods 1. 2344 steel was irradiated with uniform accelerating voltage and different pulses using high-current pulsed eletron beam. The variation rules of surface microstructure and performance of the sample before and after modification were studied. Results It turned out that the sur-face of the samples formed some crater-like defects which had different shapes, sizes and nonuniform distruction after irradiation by HCPEB. The number of crater-like defects was decreased and the diameter was increased with the increasing irradiating pulse. Austenite appeared on the surface of the irradiated samples, and the surface microhardness was increased by nearly 14. 5% when the pulse frequency exceeded 50. Conclusion After processing with high-current pulsed electron beam, the size of the grain was re-duced in the surface layer of the sample. The microhardness of the specimen was increased due to the grain refinement and the gen-eration of macroscopic residual stress.