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采用超声冲击处理工艺对22SiMn2TiB装甲钢试样进行了表面冲击强化,采用四点弯曲加载装置将处理和未处理的试样在3.5%NaCl溶液中进行了150 d的应力腐蚀试验。用X射线应力测定仪测定了应力腐蚀试验前试样表面的残余应力,用扫描电镜和透射电镜观察了处理后试样的断面组织。分析了超声冲击处理引起的残余应力和断面组织变化对改善装甲钢抗应力腐蚀性能的作用。结果表明,超声冲击处理引入的残余压应力和表层晶粒细化可以大大提高22SiMn2TiB装甲钢的抗应力腐蚀性能。
The impact strength of 22SiMn2TiB armor steel specimens was enhanced by ultrasonic impact treatment. The stress corrosion tests of treated and untreated specimens were carried out in 3.5% NaCl solution for 150 days using a four-point bending loading device. The residual stress of specimen before stress corrosion test was measured by X-ray stress analyzer. The microstructure of the specimen after treatment was observed by scanning electron microscope and transmission electron microscope. The effect of residual stress and cross-sectional microstructure changes caused by ultrasonic impacting on the stress corrosion resistance of armored steel was analyzed. The results show that the residual compressive stress and surface grain refinement introduced by ultrasonic impact treatment can greatly improve the stress corrosion resistance of 22SiMn2TiB armor steel.