摘要
采用气动喷丸方式,研究喷丸压力和喷丸时间等工艺参数对304不锈钢表面性能的影响。用X射线衍射方法检测了试样表层的晶粒尺寸和相组成,用显微硬度计测量了试样表层的显微硬度。结果表明,304不锈钢板经高能喷丸处理后,表层晶粒明显细化,达到纳米级,喷丸压力越大,晶粒越小;表层组织发生了应变诱导马氏体相变。随着喷丸压力增加,马氏体相逐渐增多,奥氏体相减少;喷丸处理后表层硬度显著提高,显微硬度值是未处理试样的2倍多;在5～15 min范围内,喷丸时间对试样表面性能影响不大。通过对弹丸粒子的运动分析,得到喷丸的能量主要与喷丸压力,弹丸密度、直径以及喷丸距离等参数有关,随着弹丸动能增大,表层晶粒逐渐减小,晶格畸变增加。
By pneumatic shot peening treatment, effect of shot peening pressures and shot peening time on the 304 stainless steel surface performance was studied. Grain size and metallographie organization of the specimen surface layer were tested with X-ray diffraction method, and surface hardness was tested by mierohardness tester. The results show that surface layer grains of 304 stainless steel was obviously refined after being treated by the high-energy shot peening, the grain size equal to the nanometer level, the strain-induced martensitic transformation was found at surface layer. With the increase of shot peening pressure, the grain size decreased and the martensitic phase increased gradually. Surface hardness was improved significantly and microhardness value was more than twice the untreated specimen. During 5 to 15 minutes, shot peening treatment time had little effect on surface properties. Through analyzing the movement of shot pellet, it could be concluded that shot peening energy depended on the shot peening parameters of pressures, pellet density, and pellet diameter and shot peening distance. With the increase of the shot peening energy, the surface grain size decreased gradually and lattice distortion increased correspondingly.
出处
《金属热处理》
CAS
CSCD
北大核心
2012年第6期44-48,共5页
Heat Treatment of Metals
基金
浙江省自然科学基金(Y1110999)
关键词
高能喷丸
304不锈钢
表面纳米化
显微硬度
high-energy shot peening （HESP）
304 stainless steel
surface nanocrystallization
microhardness
