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首页> 外文期刊>Philosophical Magazine Letters >Microstructures and tensile properties of 304 steel with dual nanocrystalline and microcrystalline austenite content prepared by aluminothermic reaction casting
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Microstructures and tensile properties of 304 steel with dual nanocrystalline and microcrystalline austenite content prepared by aluminothermic reaction casting

机译：铝热反应铸造制备具有双纳米晶和微晶奥氏体含量的304钢的组织和拉伸性能

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摘要

The microstructures of 304 stainless steels with different amounts of nanocrystalline and microcrystalline austenite prepared by an aluminothermic reaction casting, without and with annealing at 1073 K for 8 h, have been investigated by X-ray diffraction, an electron probe micro-analyser, a transmission electron microscope and a scanning electron microscope. The steels, both without and with annealing, consisted of different dual nanocrystalline and micro-crystalline austenite combinations and a little nanocrystalline 8 ferrite, while the average grain size of the nanocrystalline austenite increased from 19 to 26 nm and volume fraction of the microcrystalline austenite increased from 17 to 30% after annealing. The tensile strength of the steel was dramatically increased from 500 to 1000 MPa and the tensile elongation ratio increased from 8 to 12% after annealing. However, the tensile strength was decreased to 600 MPa and the tensile elongation ratio increased from 12 to 22% after an annealing at 1273 K. The combination of dual nanocrystalline and microcrystalline austenite obtained after the annealing at 1073 K results in the best tensile properties.
机译：通过X射线衍射，电子探针显微分析仪，透射电子显微镜研究了通过铝热反应铸造制备的不同数量的纳米晶和微晶奥氏体的304不锈钢的组织，该铸造在没有和有1073 K的条件下退火8 h。电子显微镜和扫描电子显微镜。既有退火也有退火的钢，都由不同的双纳米晶和微晶奥氏体组合以及少量的纳米晶8铁素体组成，而纳米晶奥氏体的平均晶粒尺寸从19 nm增加到26 nm，并且微晶奥氏体的体积分数增加了退火后从17％到30％。退火后，钢的抗拉强度从500 MPa急剧增加到1000 MPa，拉伸伸长率从8％增大到12％。然而，在1273 K下退火后，抗拉强度降低到600 MPa，拉伸伸长率从12％增加到22％。在1073 K下退火后获得的双纳米晶和微晶奥氏体的组合产生了最佳的拉伸性能。

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