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首页> 美国卫生研究院文献>Materials >Microstructure and Properties of Porous High-N Ni-Free Austenitic Stainless Steel Fabricated by Powder Metallurgical Route
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Microstructure and Properties of Porous High-N Ni-Free Austenitic Stainless Steel Fabricated by Powder Metallurgical Route

机译：粉末冶金法制备高氮无镍多孔奥氏体不锈钢的组织与性能

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摘要

Porous high-N Ni-free austenitic stainless steel was fabricated by a powder metallurgical route. The microstructure and properties of the prepared porous austenitic stainless steel were studied. Results reveal that the duplex stainless steel transforms into austenitic stainless steel after nitridation sintering for 2 h. The prepared high-N stainless steel consists of γ-Fe matrix and FCC structured CrN. Worm-shaped and granular-shaped CrN precipitates were observed in the prepared materials. The orientation relationship between CrN and austenite matrix is [011]CrN//[011]γ and (-1-11)CrN//(1-11)γ. Results show that the as-fabricated porous high-nitrogen austenitic stainless steel features a higher mechanical property than common stainless steel foam. Both compressive strength and Young’s modulus decrease with an increase in porosity. The 3D morphology of the prepared porous materials presents good pore connectivity. The prepared porous high-N Ni-free austenitic stainless steel has superior pore connectivity, a good combination of compressive strength and ductility, and low elastic modulus, which makes this porous high-N Ni-free austenitic stainless steel very attractive for metal foam applications.
机译：多孔高N无镍奥氏体不锈钢是通过粉末冶金工艺制造的。研究了所制备的多孔奥氏体不锈钢的组织和性能。结果表明，氮化烧结2 h后，双相不锈钢转变为奥氏体不锈钢。所制备的高氮不锈钢由γ-Fe基体和FCC结构的CrN组成。在制备的材料中观察到蠕虫状和颗粒状的CrN沉淀。 CrN与奥氏体基体之间的取向关系为[011] CrN // [011]γ和（-1-11）CrN //（1-11）γ。结果表明，所制造的多孔高氮奥氏体不锈钢具有比普通不锈钢泡沫更高的机械性能。抗压强度和杨氏模量都随孔隙率的增加而降低。所制备的多孔材料的3D形态呈现出良好的孔连通性。制备的多孔高氮无镍奥氏体不锈钢具有优异的孔连通性，良好的抗压强度和延展性以及低弹性模量，这使得这种多孔高氮无镍奥氏体不锈钢非常适合金属泡沫应用。

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