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用HJ-Ⅲ型超声冲击设备对SMA490BW钢表面进行冲击处理,利用GX-51OLYMPUS金相显微镜观察冲击处理后试样表面微观结构的变化,测试试样冲击层的深度。结果表明:超声冲击使SMA490BW钢表层产生严重的塑性变形,电流相同时塑变层深度随着冲击时间的延长而增加;电流为2.0、1.5 A时的塑变层深度基本相同,说明塑变层深度并不会随冲击强度的增加而无限增加;冲击强度相对较大时,试样表层开始出现微观缺陷使表面质量劣化。
The surface of SMA490BW steel was subjected to impact treatment with HJ-Ⅲ ultrasonic impact equipment. The microstructure of the surface of the SMA490BW steel was observed by GX-51OLYMPUS optical microscope. The depth of impact layer was tested. The results show that ultrasonic shock causes serious plastic deformation on the surface of SMA490BW steel. At the same current, the depth of plastic deformation layer increases with the increase of impact time. The depth of plastic deformation layer is basically the same when the current is 2.0 and 1.5 A, The depth does not increase indefinitely with the increase of impact strength. When the impact strength is relatively large, microscopic defects begin to appear on the surface of the specimen to deteriorate the surface quality.