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复合喷丸强化对A-100钢旋转弯曲疲劳寿命的影响
华程, 姚兰, 李国庆, 邵洋
成都飞机工业(集团)有限责任公司, 成都 610092
摘要:
对未喷丸、一次喷丸和复合喷丸的A-100钢试样进行了表面形貌、表面粗糙度、残余应力场及旋转弯曲疲劳寿命的测试,研究表面形貌、表面粗糙度、残余应力场和旋转弯曲疲劳寿命的关系,揭示A-100钢复合喷丸强化机理。结果表明:与一次喷丸相比,在表面形貌方面,复合喷丸可获得更为平整的表面形貌和更低的表面粗糙度值,复合喷丸后,Rz值较一次喷丸降低24%~47%;在残余应力方面,复合喷丸的最大残余压应力值、最大残余应力值深度和最大残余应力场深度基本无变化,而近表层(0~100 μm)的残余压应力值增大。表面形貌的改善及残余压应力场是复合喷丸强化效果的两个主要成因。在一次喷丸的基础上,复合喷丸可进一步提高A-100钢的疲劳寿命,且可以在较低的喷丸强度下获得更优的强化效果。在σmax=1000 MPa,R=-1条件下,其旋转弯曲疲劳寿命较未喷丸试样可提高50倍以上,较一次喷丸试样可提高5倍以上。
关键词:  A-100钢  复合喷丸强化  表面形貌  残余应力场  疲劳寿命
DOI:10.11933/j.issn.1007-9289.20180812001
分类号:TG668
基金项目:
Effects of Double Shot Peening on Rotational Bending Fatigue Life of A-100 Steel
HUA Cheng, YAO Lan, LI Guoqing, SHAO Yang
Chengdu Aircraft Industrial(Group)Co. LTD., Chengdu 610092, China
Abstract:
The surface topography, surface roughness, residual stress field and rotational bending fatigue life of A-100 steel specimens without shot peening, single shot peening and double shot peening were tested. The relationship between surface topography, surface roughness, residual stress field and rotational bending fatigue life was investigated to reveal the strengthening mechanism of A-100 steel with double shot peening. Results show that the double shot peening can obtain smoother surface morphology and lower surface roughness compared with the single shot peening. After the double shot peening, the Rz value is 24%-47% lower than that of the single shot peening. In terms of residual stress, the maximum residual compressive stress, maximum residual stress depth and maximum residual stress field depth of double shot peening vary slightly, while the residual compressive stress values near the surface layer (0-100 μm) increase. The improvement of the surface morphology and the residual compressive stress field are the two main reasons for the strengthening effect of double shot peening. On the basis of single shot peening, double shot peening can further improve the fatigue life of A-100 steel and obtain better strengthening effect under lower shot peening strength. On condition of σmax=1000 MPa, R=-1, the rotational bending fatigue life is more than 50 times longer than that of the unpeened sample and more than 5 times longer than that of the single peened sample.
Key words:  A-100 steel  double shot peening  surface topography  residual stress field  fatigue life