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Microstructure and Wear Study of Alloyed Layers Reinforced with Boron

机译：用硼加固合金层的微观结构和磨损研究

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Mixtures of three powders (B, Cr{sub}2B and TiB{sub}2) were applied and melted on plain carbon steel and on Calmax tool steel substrates using the PTA process. All the layers produced are well-bonded to their substrates, free of cracks and porosities and much harder than their substrates. The alloyed layer produced with boron powder has a depth of about 1300μm and a hypereutectic microstructure characterized by dispersion of iron borides, Fe{sub}2B and FeB, in a eutectic matrix. The layer produced with CrB{sub}2 powder has also a hypereutectic microstructure with (Cr{sub}x, Fe{sub}(1-x)){sub}2B borides and an average depth of 1500μm. The distribution of TiB{sub}2 grains throughout the eutectic matrix characterizes the microstructure of the layer produced with TiB{sub}2 powder, with a depth between 750-1100μm, mainly depending on the composition. The wear rates of the layers produced with both boron and Cr{sub}2B powders increase with increasing sliding speed and are both of the order of 10{sup}(-15) m{sup}3/Nm. The wear rates of the coatings produced with TiB{sub}2 powders are of the order of 10{sup}(-13) to 10{sup}(-15) m{sup}3/Nm and remain unaffected from the increase of sliding speed. Almost all the produced layers present a friction coefficient increasing with the sliding distance, except for the layers with CrB{sub}2 on steel and with B on Calmax substrate which present a constant friction coefficient value equal to 0.12.
机译：三种粉末（B，铬{子} 2B和TIB {子} 2）的混合物施加并熔融在普通碳钢和使用所述PTA过程CALMAX工具钢基材。所产生的所有层是公粘合到其底物，无裂纹和孔隙度和比其底物更难。用硼粉所产生的合金化层具有大约1300μm的深度和过共晶微结构，其特征在于铁的硼化物，铁{子} 2B和FEB的分散体中，在共晶基质。用的CrB {子} 2粉末制得的层也具有与过共晶微结构（CR {子} X，铁{子}（1-X））{}子2B硼化物和1500μm的平均深度。的TiB {子} 2个晶粒的整个共晶基质的分布表征与的TiB {子} 2粉末制造的层的微结构，具有750-1100μm之间的深度，主要取决于组合物中。与两个硼和Cr {子} 2B粉末制得的层的磨损率随滑动速度增加，并且都是10 {SUP}的顺序的（ - 15）米{SUP} 3 / Nm的。用的TiB {子} 2粉末制得的涂层的磨损率是10 {SUP}的顺序的（ - 13）到10 {SUP}（ - 15）米{SUP} 3 / nm和不受影响从增加滑动速度。几乎所有的制备的层呈现与滑动距离的摩擦系数增加，不同的是用的CrB {子} 2在钢上的各层，用B，其呈现出恒定的摩擦系数的值等于0.12 CALMAX基板上。

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