Growth kinetics of borided 316 L stainless steel obtained by selective laser melting  

选择性激光熔化制备硼化316L不锈钢的生长动力学

作　　者：DEMIRCI Selim TÜNÇAY Mehmet Masum 

机构地区：[1]Department of Metallurgical and Materials Engineering,Faculty of Engineering,Marmara University,Maltepe,34854,Istanbul,Türkiye

出　　处：《Journal of Central South University》2025年第2期332-349,共18页中南大学学报(英文版)

摘　　要：Selective laser melting(SLM)is a cost-effective 3 D metal additive manufacturing(AM)process.However,AM 316 L stainless steel(SS)has different surface and microstructure properties as compared to conventional ones.Boriding process is one of the ways to modify and increase the surface properties.The aim of this study is to predict and understand the growth kinetic of iron boride layers on AM 316 L SS.In this study,the growth kinetic mechanism was evaluated for AM 316 L SS.Pack boriding was applied at 850,900 and 950℃,each for 2,4 and 6 h.The thickness of the boride layers ranged from(1.8±0.3)μm to(27.7±2.2)μm.A diffusion model based on error function solutions in Fick’s second law was proposed to quantitatively predict and elucidate the growth rate of FeB and Fe_(2)B phase layers.The activation energy(Q)values for boron diffusion in FeB layer,Fe_(2)B layer,and dual FeB+Fe_(2)B layer were found to be 256.56,161.61 and 209.014 kJ/mol,respectively,which were higher than the conventional 316 L SS.The findings might provide and open new directions and approaches for applications of additively manufactured steels.选择性激光熔化(SLM)是一种经济高效的三维金属增材制造(AM)工艺。然而,与传统材料相比AM 316L SS具有不同的表面和微观结构特性。渗硼工艺是改善和提高表面性能的方法之一。本研究的目的是预测和了解AM 316L不锈钢上的硼化物层的生长动力学。在本研究中,首先对AM 316L不锈钢的生长动力学机制进行了评价。在850、900和950℃下进行填料渗硼2、4和6 h。硼化物层的厚度范围为(1.8±0.3)μm至(27.7±2.2)μm。提出了一种基于菲克第二定律误差函数解的扩散模型来定量预测和描述FeB和Fe_2B相层的生长速率。硼在FeB层、Fe_2B层和FeB+Fe_2B双层中的扩散活化能分别为256.56、161.61和209.014 kJ/mol,比传统316L SS的活化能高。研究结果可能为增材制造钢提供并开辟新的方向。

关 键 词：316L stainless steel BORIDING KINETICS additive manufacturing selective laser melting 

分 类 号：TG174.4[金属学及工艺—金属表面处理]