合金球墨铸铁的渗硼动力学研究  

Study of Boriding Kinetics for Alloyed Ductile Irons

作　　者：Fabio Edson Mariani Galtiere Correa Rego Luiz Carlos Casteletti Amadeu Lombardi Neto George Edward Totten 本刊编辑部 Fabio Edson Mariani Galtiere Correa Rego Luiz Carlos Casteletti Amadeu Lombardi Neto George Edward Totten(Universidade de Sao Paulo, Sao Carlos, Federal do Parana, Londrina, Parana, Brazil 3. Sao Paulo, Brazi 2. Universidade Tecnologica Portland State University, Portland, Oregon, US)

机构地区：[1]Universidade de Sao Paulo [2]Universidade Tecnologica Federal do Parana [3]美国金属学会冷却技术委员会 [4]美国波特兰州立大学

出　　处：《热处理》2016年第5期31-37,共7页Heat Treatment

摘　　要：渗硼层硬度高,能改善球墨铸铁(以下简称球铁)的摩擦学性能,而等温淬火能提高基体的力学性能。对含Cu、Cu-Ni和Cu-Ni-Mo的合金球铁试样进行了盐浴(硼砂+铝)渗硼,渗硼温度分别为850℃、900℃和950℃,时间2 h和4 h。通过所获得的渗层数据确定合金球铁渗硼的扩散系数和激活能。计算求得的扩散系数与通过直接测定渗层厚度得出的扩散系数相接近。含Cu或Cu-Ni的试样激活能为141.27 kJ/mol,而含Cu-Ni-Mo的试样激活能为212.98 kJ/mol。统计参数与相关系数(尺)吻合良好。Boriding thermochemical treatment produces layers with high hardness which improves the tribological performance of ductile cast iron while the austempering treatment improves the mechanical performance of the substrate. In this work, samples of the ductile cast iron alloyed with copper, copper-nickel and copper-nickelmolybdenum were borided in a salt bath （borax ＋ aluminum） at temperatures of 850, 900 and 950 ℃ during 2 and 4 hours. The data for the layers obtained were used to determine the diffusion coefficients and activation energies of this process. The results of the calculated diffusion coefficients were similar to those obtained by the direct measurements of the layer thicknesses. For the sample alloyed with Cu or Cu-Ni the activation energy obtained was 141.27 kJ/mol, and for the sample alloyed with Cu-Ni-Mo the value was 212.98 kJ/mol. The statistical parameters and the correlation coefficients （R） showed satisfactory agreement.

关 键 词：合金球铁 渗硼 扩散系数 激活能 

分 类 号：TG156.87[金属学及工艺—热处理]