Influence of Ultrasonic Surface Rolling on Impact-Shear Wear Behavior of Ni Base 690 Alloy
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摘要:
通过超声表面滚压技术(USRP)改善镍基690合金表面的粗糙度和硬化层，并探究该工艺对其冲-切磨损行为的影响机理. 首先，采用USRP对镍基690合金表面进行强化处理，然后，基于可控能量式冲-切磨损试验装置，探究镍基690合金强化前后在不同冲-切变量下其磨损界面的动态响应行为与损伤机理. 得出了USRP工艺可有效降低磨损界面的摩擦力和摩擦系数，降低冲切能耗，进而减少材料的磨损程度，此外，冲击或切向滑动速度的增加均会导致磨损界面所受冲击力和摩擦力的增大，并降低动能吸收率.
Abstract:Ultrasonic surface rolling process (USRP) was applied to improve the surface roughness and microhardness of Inconel 690 alloy. Moreover, the effect of this process on the impact-sliding wear behavior of Inconel 690 alloy was investigated. First, Inconel 690 alloy was selected as the test material, and the size specifications of the specimen were 10 mm×10 mm×5 mm cuboids. The chemical composition of Inconel 690 alloy was Ni 59.48%, Cr 29.5%, Al 0.36%, C 0.022%, Si 0.38%, Mn 0.42%, P 0.012% and S 0.025%. Before ultrasonic surface rolling, different specifications (800, 1000, 1200 and 1500 Cw) of silicon nitride sandpaper were used sequentially to polish the required reinforced surface, and then 0.5 μm diamond grinding paste was used to polish the polished surface until the mirror surface; then absolute ethanol was used to wash in an ultrasonic cleaner for 15 minutes, and finally the sample surface was dried with compressed air. the Inconel 690 alloy’s surface was treated using USRP under specific process parameters. Second, on the basis of an energy control impact-sliding wear test rig, the impact block hit the specimen in motion at a set initial speed (vi) in the impact direction. Among them, the mass (m) of the normal impact block was 800 g, and the total number of punching cycles (n) per test was 10 000. Immediately afterwards, an optical microscope was used to observe the shape and morphology of the resulting wear marks. The alloy’s surface dynamic mechanical response behavior and damage mechanism were examined under different impact or sliding velocities. The rebound velocity of Inconel 690 alloy under the same test conditions was significantly improved due to the refinement of the surface grain, smoother surface, and reduced tangential friction during punching and shearing wear, and the maximum increase of rebound speed was 30.9%, which occurred when the impact velocity was 30 mm/s. At an impact velocity of 30 mm/s and a tangential velocity of 60 mm/s, the friction coefficients of the untreated specimen and the USRP-treated specimen were approximately 0.23 and 0.17, respectively. Under the same impact-sliding wear conditions, the friction coefficients of USRP-treated specimens was smaller than that of untreated specimens. With the increase of impact velocity, the friction coefficient of the surface decreased, and the friction coefficient treated by USRP was also reduced compared with the friction coefficient of the untreated surface, and the friction coefficient of the reinforced Inconel 690 alloy surface decreased by 26.09%. USRP could effectively decrease the friction force, friction coefficient and impact-sliding dissipated energy during the impact-sliding wear process, thereby reducing the wear degree. In addition, the increased impact or sliding velocity increased the friction force and decreased the dissipated rate of impact kinetic energy.
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图 3 冲击速度变化情况(n=600, vs = 60 mm/s)：(a)未经强化处理；(b) 经USRP处理
Figure 3. Impact velocity variations (n=600, vs = 60 mm/s): (a) untreated; (b) USRP treated
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图 4 冲击动能变化曲线 (n=600, vi = 60 mm/s)：(a)未经强化处理；(b)经USRP处理
Figure 4. Impact kinetic energy change curve (n=600, vi = 60 mm/s): (a) untreated; (b) USRP treated
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图 5 动能吸收率(n=600)：(a) vi = 60 mm/s；(b) vs = 60 mm/s
Figure 5. Kinetic absorption energy rate (n=600): (a) vi = 60 mm/s; (b) vs = 60 mm/s
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图 6 磨损界面所受的冲击力及最大冲击力 (n=600)：(a)未经强化处理，vs = 60 mm/s；(b)经USRP处理，vs = 60 mm/s；(c) vs = 60 mm/s
Figure 6. The impact force and maximum impact force of the wear interface (n=600): (a) untreated, vs = 60 mm/s; (b) USRP treated, vs = 60 mm/s; (c) vs = 60 mm/s
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图 7 磨损界面所受摩擦力(n=600)：(a)未经强化处理，vs = 60 mm/s；(b)经USRP处理，vs = 60 mm/s；(c)未经强化处理，vi = 60 mm/s; (d)经USRP处理，vi = 60 mm/s
Figure 7. The friction force of the wear interface (n=600): (a) untreated, vs = 60 mm/s; (b) USRP treated, vs = 60 mm/s; (c) untreated, vi = 60 mm/s; (d) USRP treated, vi = 60 mm/s
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图 8 磨损界面所受的最大摩擦力(n=600)
Figure 8. The maximum friction force on the wear interface (n=600)
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图 9 磨损界面的摩擦系数(vs =60 mm/s)：(a)未经强化处理；(b)经USRP处理
Figure 9. Coefficient of friction at the wear interface (vs = 60 mm/s): (a) untreated; (b) USRP treated
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图 10 磨痕光学显微镜图 (vs=60mm/s)：(a)未经强化处理；(b)经USRP处理
Figure 10. Light microscope photograph of abrasion scar (vs=60mm/s): (a) untreated; (b) USRP treated
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图 11 磨痕电子显微镜照片 (vs=60 mm/s)：(a)未经强化处理；(b)经USRP处理
Figure 11. SEM micrographs of wear scars (vs=60 mm/s): (a) untreated; (b) USRP treated
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图 12 经USRP前后试样冲-切磨损行为对比图
Figure 12. Comparison chart of impact-sliding wear behavior of specimens before and after USRP
表 1 超声表面滚压工艺参数
Table 1 Process parameters for ultrasonic surface rolling
Ultrasonic rolling parameters Current Feed rate Pre-pressure The amount of pressure down Number of rolls Specifications 0.5 A 2 000 mm/min 0.4 MPa 0.2 mm 2, 4 
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表 2 冲-切磨损试验参数
Table 2 Impact-sliding wear test parameters
Experimental variables Impact velocity, vi Sliding velocity, vs 1 2 1 2 Speed value/(mm/s) 30 60 90 60 60 40 60 90
下载: 导出CSV
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