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Effect of Precarburization on Growth Kinetics and Mechanical Properties of Borided Low-Carbon Steel

机译：预渗碳对渗碳低碳钢生长动力学和力学性能的影响

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Bonding is a thermochemical process employed widely for increasing the resistance of ferrous materials to wear and corrosion. In this work, the influence of precarburization on microstructure, boride layer thickness, microhardness, growth kinetics, and mechanical properties of untreated and borocarburized AISI1015 steel is studied. The thickness of boride layer ranges from 205.9 to 215.9μm for borocarbur-ized specimens to a maximum of 247.7 μm for borided AISI 1015 steel. The carbon content in the case improves the microstructure by the formation of single-phase iron boride mainly on the surface. Boride layer thickness decreases with increase in carbon content of the case. Activation energy for the borided AISI 1015 steel is 119.22 KJ/mol. The activation energies are 174.4and 194.7 KJ/mol for borocarburized AISI 1015 steel having 0.30% C and 0.45% C, respectively. The activation energy increases with increase in carbon content due to precarburization. Empirical relations have been developed to predict boride layer thickness and are well correlated with experimental values for the process temperature and time. Tensile strength ranges from 421 to 599N/mm~2. Impact strength of borided specimens varies between 386.7 and 493.3 N-m while for borocarburized specimens it ranges between 103.7 N-m and 183.3 N-m. Fracture behavior of borided and borocarburized specimens under tensile and impact tests has been analyzed.
机译：粘结是一种热化学工艺，广泛用于提高黑色金属材料的耐磨性和耐腐蚀性。在这项工作中，研究了预渗碳处理对未经处理和渗碳的AISI1015钢的显微组织，硼化物层厚度，显微硬度，生长动力学和力学性能的影响。硼碳化样品的硼化物层厚度范围为205.9至215.9μm，而硼化AISI 1015钢的最大厚度为247.7μm。该情况下的碳含量通过主要在表面上形成单相硼化铁而改善了显微组织。硼化物层的厚度随着壳体中碳含量的增加而减小。硼化AISI 1015钢的活化能为119.22 KJ / mol。对于具有0.30％C和0.45％C的硼碳化AISI 1015钢，活化能分别为174.4和194.7 KJ / mol。由于预渗碳，活化能随碳含量的增加而增加。已经建立了经验关系来预测硼化物层的厚度，并与过程温度和时间的实验值很好地相关。拉伸强度范围为421至599N / mm〜2。硼化试样的冲击强度在386.7和493.3 N-m之间变化，而硼碳共渗试样的冲击强度在103.7 N-m和183.3 N-m之间变化。分析了在拉伸和冲击试验下硼化和硼化碳试样的断裂行为。

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