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首页> 外文期刊>Optics & Laser Technology >Microstructure and properties of laser-borided composite layers formed on commercially pure titanium
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Microstructure and properties of laser-borided composite layers formed on commercially pure titanium

机译：商业纯钛上形成的激光熔覆复合层的组织和性能

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Laser-boriding was proposed in order to produce composite boride layers on commercially pure titanium. Three zones were observed in the microstructure: laser-borided re-melted zone (TiB, TiB_2 and Ti _α′-phase), heat affected zone (Ti _α′-phase) and the substrate without heat treatment (Ti_α-phase). The stick-like titanium borides occurred in the re-melted zone. In some areas, the tubular nature of titanium borides was visible. Among the sticks of titanium borides the needles of Ti _α′-phase appeared. The high overlapping of multiple laser tracks (86%) caused the formation of uniform laser-alloyed layer in respect of the thickness. The microcracks and pores were not detected in the laser-borided composite layer. The high hardness of the re-melted zone (1250-1650 HV) was obtained. The hardness gradually decreased up to 250-300 HV in heat affected zone and up to about 200 HV in the substrate. In case of higher laser beam power used (1.95 kW), the re-melted zone was thicker and more homogeneous in respect of the microstructure and hardness. The craters obtained at the surface after the Rockwell C indentation test evidently revealed ideal cohesion of the laser-borided layer (HF1 standard). The significant increase in wear resistance of laser-borided composite layers was observed in comparison with commercially pure titanium. The lower mass wear intensity factors were obtained for laser-alloyed layers. The measurements of relative mass loss were also used in order to evaluate wear behavior of the investigated materials. The tests of laser-borided layers showed the catastrophic wear of the counter-specimens. The separated particles of counter-sample caused the accelerated wear of the laser-alloyed specimen. The longer duration of the tests, carried out without the change in a counter-specimen, caused the adhesion of counter-sample particles on the laser-borided specimen. The increased contact surface was the reason for the higher temperature and created the favourable conditions for this adhesive wear.
机译：为了在商业纯钛上生产复合硼化物层，提出了激光硼化。在显微组织中观察到三个区域：激光烧结的重熔区（TiB，TiB_2和Ti_α'相），热影响区（Ti​​_α'相）和未经热处理的基板（Ti_α相）。棒状硼化钛出现在重新熔化区。在某些地区，可以看到硼化钛的管状性质。在硼化钛棒中出现了Ti_α'相针。多个激光轨迹的高度重叠（86％）导致形成厚度均匀的激光合金层。在激光烧结的复合层中未检测到微裂纹和孔。获得了重熔区（1250-1650 HV）的高硬度。在热影响区中，硬度逐渐降低至250-300 HV，在基材中，硬度逐渐降低至约200 HV。在使用更高的激光束功率（1.95 kW）的情况下，就微观结构和硬度而言，重熔区更厚且更均匀。洛氏C压痕测试后在表面获得的弹坑明显显示出激光钻孔层（HF1标准）的理想内聚力。与市售的纯钛相比，观察到激光烧结复合层的耐磨性显着提高。对于激光合金层，获得了较低的质量磨损强度因子。还使用相对质量损失的测量值来评估所研究材料的磨损行为。激光镀硼层的测试表明，抗标本具有灾难性的磨损。分离的反样品颗粒导致激光合金化样品的加速磨损。在不改变反试样的情况下进行的更长的测试时间导致反试样颗粒在激光钻孔的试样上的粘附。接触表面的增加是温度升高的原因，并为这种粘合剂的磨损创造了有利的条件。

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