Kubit Andrzej, Lenart Łukasz, Trzepieciński Tomasz, Krzysiak Andrzej, Łabuński Wojciech
Department of Manufacturing and Production Engineering, Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Al. Powst. Warszawy 8, 35-959 Rzeszów, Poland.
Walter, Pustyny, ul. Księża 83, 38-422 Krościenko Wyżne, Poland.
Materials (Basel). 2021 Nov 12;14(22):6831. doi: 10.3390/ma14226831.
The aim of the research presented in this article is analysis of the effect of the surface treatment method on the static and fatigue strength of flash butt welded bandsaw blades. A 1-mm-thick 75Cr1 cold-work tool steel sheet used for bandsaw blades was used as the test material. Fractographic studies of the fatigue fractures and fractures formed in static tests were also carried out. The static strength tests showed sandblasting the weld surface had no significant effect on the load capacity of the joint. However, the sandblasted specimens showed a higher repeatability of the load capacity (lower standard deviation). In the case of both analyzed sample variants of specimens, sandblasted and non-sandblasted, the number of cycles at which the sample was damaged decreases with the percentage increase of the stress amplitude. When loading the samples with a stress amplitude value in the range between 400 and 690 MPa, sandblasting of the weld surface increased the average value of destructive cycles by about 10-86% (depending on the stress amplitude) compared to non-sandblasted joints. The sandblasting process introduces compressive stresses in the surface layer of the welds, therefore the variable tensile load acting on the sample requires a greater number of cycles before the fatigue cracks initiate and propagate. In the case of all specimens, a ductile fracture was observed. It was also found that, regardless of the variable stress amplitude, sandblasting has a positive effect on reducing the standard deviation of fatigue test results.
本文所呈现的研究目的是分析表面处理方法对闪光对焊带锯条静强度和疲劳强度的影响。将用于带锯条的1毫米厚75Cr1冷作工具钢板用作试验材料。还对疲劳断裂和静态试验中形成的断裂进行了断口分析研究。静强度试验表明，对焊缝表面进行喷砂处理对接头的承载能力没有显著影响。然而，喷砂处理的试样显示出承载能力的更高重复性（更低的标准偏差）。在分析的喷砂和未喷砂两种试样变体情况下，试样损坏时的循环次数随着应力幅值百分比的增加而减少。当以400至690兆帕之间的应力幅值加载试样时，与未喷砂的接头相比，对焊缝表面进行喷砂处理使破坏循环的平均值提高了约10 - 86%（取决于应力幅值）。喷砂过程在焊缝表层引入了压缩应力，因此作用在试样上的可变拉伸载荷在疲劳裂纹萌生和扩展之前需要更多的循环次数。在所有试样的情况下，均观察到韧性断裂。还发现，无论应力幅值如何变化，喷砂处理对降低疲劳试验结果的标准偏差都有积极作用。
