引用本文:王欣， 胡云辉， 曾惠元， 钟平， 汤智慧， 宋颖刚.结构应力集中和表面完整性对17-4PH钢轴向疲劳性能的影响[J].中国表面工程,2016,29(2):111~116
WANG Xin, HU Yunhui, ZENG Huiyuan, ZHONG Ping, TANG Zhihui, SONG Yinggang.Effects of Structural Stress Concentration and Surface Integrity on Axial Fatigue Property of 17-4PH Steel[J].China Surface Engineering,2016,29(2):111~116
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结构应力集中和表面完整性对17-4PH钢轴向疲劳性能的影响
王欣， 胡云辉， 曾惠元， 钟平， 汤智慧， 宋颖刚1,2,3
1. 北京航空材料研究院 航空材料先进腐蚀与防护航空重点实验室;2. 西安航空发动机（集团）有限公司 研制中心;3. 北京航空材料研究院 第三研究所
摘要:
结构因素和加工方式对零件疲劳性能具有重要的影响。采用车削、磨削和喷丸等方法改变光滑（Kt=1）和缺口（Kt=2）两种结构应力集中状态试样的表面完整性，表征了6种应力集中和表面完整性状态下174PH沉淀硬化不锈钢的高频轴向疲劳应力寿命曲线，并研究了表面残余应力和表面粗糙度等表面完整性参数。将光滑车削状态的疲劳极限作为基线。结果表明：在光滑条件下，磨削、车削喷丸和磨削喷丸后疲劳极限较基线分别提高18.1%，21.4%和26%；而在缺口条件下，相比于基线，磨削疲劳极限下降了20.8%，喷丸后的疲劳性能较磨削提高25.9%。车削、磨削、车削喷丸和磨削喷丸后粗糙度分别为1.733、0.819、2.251和2.228 μm。结构应力集中状态对于疲劳性能的影响大于表面完整性，但对于确定的结构，表面完整性对于疲劳性能亦有重要影响。
关键词:  结构应力集中  表面完整性  疲劳性能  喷丸
DOI：10.11933/j.issn.1007-9289.2016.02.016
分类号:
基金项目:
Effects of Structural Stress Concentration and Surface Integrity on Axial Fatigue Property of 17-4PH Steel
WANG Xin, HU Yunhui, ZENG Huiyuan, ZHONG Ping, TANG Zhihui, SONG Yinggang1,2,3
1. Aviation Key Laboratory of Advanced Corrosion and Protection on Aviation Materials, Beijing Institute of Aeronautical Material;2. Manufacturer Center, Xi’an Aeroengine （Group） LTD.;3. Laboratory 3, Beijing Institute of Aeronautical Material
Abstract:
Structure factor and mechining process have important effects on the fatigue property. Turning, grinding and shot peening were applied to specimens of two structural stress concentration conditions (smooth: stress concentration coeffient Kt=1, notched: Kt=2) to introduce different surface integrties. Axial fatigue SN curves of 174PH steel on six structural stress concentration and surface integrity conditions were characterized; moreover, the surface residual stress and roughness were tested. The smooth turning condition was chosen as the baseline. The results show that on the smooth condition, fatigue limits of grinding, turningpeening and grindingpeening increase 18.1%, 21.4% and 26%, respectively, compared with the baseline. However, in contrast on the notched condition, the fatigue limit of grinding decreases by 20.8% compared with the baseline. Moreover, the fatigue property after grindingpeening increase 25.9% in comparison of grinding. The surface roughnesses Ra after turning, grinding, turingpeening and grindingpeening are 1.733, 0.819, 2.251 and 2.228 μm, respectively. The effects of structural stress concentration on fatigue performance are greater than that of surface integrity. However, surface integrity also has an important influence on fatigue for the certain structure.
Key words:  structural stress concentration  surface integrity  fatigue property  shotpeening
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