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The Effects of Laser‐Assisted Ultrasonic Nanocrystal Surface Modification on the Microstructure and Mechanical Properties of 300M Steel
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-11-10 , DOI: 10.1002/adem.202001203
Weidong Zhao 1, 2 , Daoxin Liu 1 , Jun Liu 2 , XiaoHua Zhang 1 , Hao Zhang 2 , Ruixia Zhang 2 , Yalin Dong 2 , Chang Ye 2
Affiliation  

Herein, an innovative surface severe plastic deformation method, laser‐assisted ultrasonic nanocrystal surface modification (LA‐UNSM), is used to treat 300M ultra‐high‐strength steel. The results show that the synergistic effect of laser heating and ultrasonic striking results in a thicker plastic deformation layer in 300M steel compared with UNSM treatment alone. Moreover, the depth of the deformation layer gradually increases as the laser power level is increased. At the laser power of 68 W, the greatest thickness in the plastic deformation layer (≈53.6 μm) is observed, which is 1.7 times the thickness in the UNSM‐treated samples. In addition, the surface of 300M steel forms dense oxide following LA‐UNSM treatment and the surface oxide concentration increases with laser power level. Because of the martensitic lath refinement, work hardening, and oxidation, the highest surface hardness is obtained after LA‐UNSM treatment at 45 W. As higher plastic strain is induced when a smaller UNSM tip (1.5 mm) is used, the largest and deepest surface plastic deformation layer is obtained in the LA‐UNSM‐45 W‐1.5 mm sample. However, the most significant hardness difference between LA‐UNSM and UNSM is observed when the 4.0 mm tip is used. This study shows that LA‐UNSM can effectively improve the hardness of high‐strength metals.

中文翻译:

激光辅助超声纳米晶表面改性对300M钢组织和力学性能的影响

在此,一种创新的表面严重塑性变形方法,即激光辅助超声纳米晶体表面改性(LA-UNSM),用于处理300M超高强度钢。结果表明,与单独的UNSM处理相比,激光加热和超声打击的协同作用导致300M钢中的塑性变形层更厚。而且,变形层的深度随着激光功率水平的增加而逐渐增加。在68 W的激光功率下,观察到塑性变形层的最大厚度(≈53.6μm),这是经UNSM处理的样品的最大厚度的1.7倍。此外,经过LA‐UNSM处理后,300M钢的表面形成致密的氧化物,并且表面氧化物的浓度随激光功率的增加而增加。由于马氏体板条的细化,加工硬化,以及氧化作用,在45 W的LA‐UNSM处理后可获得最高的表面硬度。当使用较小的UNSM尖端(1.5 mm)导致较高的塑性应变时,在LA‐UN中可获得最大和最深的表面塑性变形层UNSM‐45 W‐1.5毫米样品。但是,使用4.0 mm吸头时,在LA‐UNSM和UNSM之间观察到最明显的硬度差异。这项研究表明,LA‐UNSM可以有效提高高强度金属的硬度。使用0毫米针尖。这项研究表明,LA‐UNSM可以有效提高高强度金属的硬度。使用0毫米针尖。这项研究表明,LA‐UNSM可以有效提高高强度金属的硬度。
更新日期:2020-11-10
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