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Selective Laser Melting of Duplex Stainless Steel 2205: Effect of Post-Processing Heat Treatment on Microstructure Mechanical Properties and Corrosion Resistance

机译：双相不锈钢2205的选择性激光熔化：后热处理对组织机械性能和耐腐蚀性的影响

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摘要

Additive manufacturing (AM) is a rapidly growing field of technology. In order to increase the variety of metal alloys applicable for AM, selective laser melting (SLM) of duplex stainless steel 2205 powder and the resulting microstructure, density, mechanical properties, and corrosion resistance were investigated. An optimal set of processing parameters for producing high density (>99.9%) material was established. Various post-processing heat treatments were applied on the as-built predominantly ferritic material to achieve the desired dual-phase microstructure. Effects of annealing at temperatures of 950 °C, 1000 °C, 1050 °C, and 1100 °C on microstructure, crystallographic texture, and phase balance were examined. As a result of annealing, 40–46 vol.% of austenite phase was formed. Annealing decreased the high yield and tensile strength values of the as-built material, but significantly increased the ductility. Annealing also decreased the residual stresses in the material. Mechanical properties of the SLM-processed and heat-treated materials outperformed those of conventionally produced alloy counterparts. Using a scanning strategy with 66° rotation between layers decreased the strength of the crystallographic texture. Electrochemical cyclic potentiodynamic polarization testing in 0.6 M NaCl solution at room temperature showed that the heat treatment improved the pitting corrosion resistance of the as-built SLM-processed material.
机译：增材制造（AM）是一个快速发展的技术领域。为了增加适用于增材制造的金属合金的种类，研究了双相不锈钢2205粉末的选择性激光熔化（SLM）以及所得的显微组织，密度，机械性能和耐腐蚀性。建立了用于生产高密度（> 99.9％）材料的最佳工艺参数集。对已建成的主要为铁素体材料进行各种后处理热处理，以实现所需的双相微结构。研究了在950°C，1000°C，1050°C和1100°C的温度下退火对显微组织，晶体织构和相平衡的影响。退火的结果是形成了40-46％（体积）的奥氏体相。退火降低了成品材料的高屈服强度和抗拉强度值，但显着提高了延展性。退火还减少了材料中的残余应力。经SLM处理和热处理的材料的机械性能优于传统生产的合金。使用在层之间旋转66°的扫描策略会降低晶体织构的强度。在室温下于0.6 M NaCl溶液中进行的电化学循环电位极化测试表明，热处理提高了SLM处理材料的抗点蚀性。

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