Fabrication of high nitrogen austenitic stainless steels by powder metallurgy
Fabrication of high nitrogen austenitic stainless steels by powder metallurgy
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粉末冶金高氮奥氏体不锈钢的制备
DOI：
10.2497/jjspm.46.1249
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
S. Takaki
中科院分区：
文献类型：
--
作者：
K. Kataoka;T. Tsuchiyama;H. Goto;S. Takaki
几种高氮粉将氮化（Cr 2N）、雾化23mass%Cr钢加4mass%N（AT-4 N）、机械球磨23mass%Cr钢加4mass%N（MM-4 N）与无氮粉末混合（雾化16mass%Cr钢、雾化23mass%Cr钢（AT）、机械铣削23mass%Cr钢（MM））制备平均化学成分的高氮不锈钢; Fe-23质量% Cr-1质量%N。将粉末混合物在真空中填充在不锈钢管中，然后通过热轧进行致密化。固结后的材料在1473 K下退火1.8ks以达到均匀化的目的。在其中添加Cr 2N或AT-4 N粉末作为氮供应剂的粉末混合物中，未进行完全致密化。在将MM-4 N粉末作为氮供应剂添加到无氮MM粉末中的情况下，粉末混合物被固结成具有全密度的材料。组织为奥氏体，晶粒尺寸约为5μm。奥氏体钢由于其细晶组织和全密度，比相同成分的烧结材料具有更高的强度和延伸率。
A few kinds of high nitrogen powders (nitride (Cr2N), atomized 23mass%Cr steel with 4mass%N (AT-4N), mechanically milled 23mass%Cr steel with 4mass%N (MM-4N)) were mixed with nitrogen-free powders (atomized 16mass%Cr steel, atomized 23mass%Cr steel (AT), mechanically milled 23mass%Cr steel (MM)) to fabricate the high nitrogen stainless steel of the mean chemical composition; Fe-23mass%Cr-lmass%N. The powder mixtures were packed in stainless steel tubes in vacuum and then consolidated by hot rolling for densification. The consolidated materials were annealed at 1473K for 1.8ks for the purpose of homogenization. In the powder mixtures, in which the Cr2N or the AT-4N powder was added as the nitrogen supplier, full densification was not performed. In the case that the MM-4N powder was added as the nitrogen supplier to the nitrogen-free MM powder, the powder mixture was consolidated to the material with full density. The structure is of austenite with the grain size of about 5μm. The austenitic steel has much higher strength and elongation than the sintered material with the same composition, because of its fine grained structure and its full density.