Processing of Fine-Grained Stainless Steels for Improved Oxidation Resistance

小行星9322621 该SGER赠款探索了一种加工方法（喷射成形），以创建抗氧化不锈钢合金。 需要精细的晶粒尺寸，这是通过喷射成形和引入氮化铝和硼化钛的高稳定沉淀物以抵抗晶粒生长来实现的。 预期所生产的不锈钢具有上级高温抗氧化性，这是由于其能够形成薄的连续二氧化硅层，所述二氧化硅层充当外部氧化铬层与块体合金之间的扩散阻挡层。 这项研究可能会导致加工方法的发展，以生产更便宜，高抗氧化性的不锈钢，含有较低浓度的铬。 ***

9322621 Basu This SGER grant explores a method of processing (spray forming) to create oxidation-resistant stainless steel alloys. A fine grain size is required, and this is accomplished by spray forming and introduction of highly-stable precipitates of aluminum nitride and titanium boride to resist grain growth. The stainless steel produced is expected to have superior high temperature oxidation resistance due to its ability to form thin continuous silica layers that act as diffusion barriers between the exterior chromia layer and the bulk alloy. %%% This research could lead to the development of processing methods to produce less expensive, highly oxidation-resistant stainless steels that contain lower concentrations of chromium. ***