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The cross-sectional areas of the samples produced with different laser powers are obtained in Fig. 5. They illustrate the increase in melt volume with increasing laser power. The samples are mainly free of pores. Cracks were found underneath the surface for laser powers of 3 kW and sporadically for laser powers of 4 kW. For higher laser powers of 5 kW, no cracks occurred, but some asperities were observed in the center regions of the former melt pool. With increasing laser power from 3 to 5 kW, the melt pool area increases from 8.3 to 19.9 mm2 (Fig. 6). Between 3 and 4 kW, the increase in melt pool area is 85%. With a further increase in laser power to 5 kW, the melt pool area increases further by 29%. The diagram shows that the hardness of the samples is affected by the increasing melt pool area. The micro-hardness decreases from 440 HV0.
In Utah, hobos are frequently found indoors from August through October. This inward migration is driven by their mating season. Males are searching for females at this time and are following chemical scents (pheromones) given off by female hobo spiders. Houses with old or broken door sweeps, windows/screens, no weather stripping around exterior doors, foundation cracks, etc., are at greater risk for hobo invasion. Fix these structural issues and the number of hobos capable of coming into the home will decrease. You can use non-pheromone baited sticky traps to monitor areas where you suspect hobos might be entering. After mating, the males will die. Females will move outside to deposit their egg sacs and will also die. Juveniles may be found in the home throughout the remainder of the year, but are infrequent.
LiSE-hardness measurement is a non-destructive and quick process and can be used to perform a large number of samples in a short time. However, the laser power setting for the deep rolling process is difficult to determine and has to be adjusted for each micro-sample. The results show that, for crack-free micro-samples, the same laser power settings can be used for the two methods. For crack-containing micro-samples, the deep rolling process has to be adjusted accordingly to be able to obtain results comparable to LiSE-hardness measurement. The deep rolling process not only reduces the total time required for the entire experiment but also helps determine the laser power setting at first. In this way, the samples can be prepared more quickly and the laser power can be determined with less effort and less error (Fig. 15).
Nevertheless, some limitations can be observed in our study. For instance, all samples were produced with the same laser power of 5 kW. Thus, we could not test the influence of the laser power on the hardness of the samples. However, we could observe that the samples produced with higher laser powers (6 kW) have slightly higher hardness than the 3 kW samples. Thus, higher laser powers could improve the hardness of the material. Furthermore, we evaluated the hardness of the samples by means of Vickers indentation. The indentation load was 0.98 N and the indentation diameter was 13.36 mm. 827ec27edc