Improved oxidation resistance of the Zr-alloyed layer formed on 420 stainless steel by plasma surface alloying

Improved oxidation resistance of the Zr-alloyed layer formed on 420 stainless steel by plasma surface alloying
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等离子表面合金化在420不锈钢上形成的Zr合金层提高了抗氧化性

DOI:
10.1016/j.surfcoat.2012.05.136
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发表时间:
2013-08
影响因子:
5.4
通讯作者:
He, Z. Y.
He, Z. Y.
中科院分区:
材料科学1区
文献类型:
--
作者:
Liu, X. P.;You, K.;Chen, K.;Wang, F.;Wang, Z. X.;He, Z. Y.

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针对420不锈钢高温性能差的问题,采用等离子表面合金化技术在其表面制备了锆合金层。研究了锆合金不锈钢的氧化行为。结果表明,Zr合金化层厚度约为5μm,与钢基体结合牢固,主要成分为ZrC、Cr23 C6和金属Zr。在1000°C下的循环氧化试验表明,Zr合金试样在空气中暴露100 h后的氧化增重仅为0.9mg/cm ~ 2,具有良好的抗氧化性能。在合金化不锈钢上形成的薄氧化皮是致密的,并且牢固地粘附到氧化基底上。Zr合金化420钢抗氧化性能的提高是由于在内层Fe 3 O 4 + Cr2 O3氧化物与基体之间形成了稳定的外层富ZrO 2层和富Cr2 O3层。
A Zr-alloyed layer is prepared on the 420 stainless steel by plasma surface alloying technique in order to improve its poor elevated temperature property. The oxidation behavior of the Zr-alloyed stainless steel is studied in the paper. It is found that the Zr-alloyed layer with approximately 5μm in thickness is bonded strongly to the steel substrate and consists of ZrC, Cr23C6and metallic Zr. The result of a cycling oxidation at 1000°C indicates that the mass gain of Zr-alloyed specimens is only 0.9mg/cm2after exposure for 100h in air, exhibiting an excellent oxidation resistance. A thin oxide scale formed on the alloyed stainless steel is compact and strongly adheres to the oxidized substrate. The improvement of the oxidation resistance for the Zr-alloyed 420 steel is attributed to the formation of a stable outer ZrO2-rich layer and the Cr2O3-rich layer between the inner Fe3O4+Cr2O3oxide and the substrate.
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