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首页> 外文期刊>ISIJ international >Production and Properties of Nano-scale Oxide Dispersion Strengthened (ODS) 9Cr Martensitic Steel Claddings
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Production and Properties of Nano-scale Oxide Dispersion Strengthened (ODS) 9Cr Martensitic Steel Claddings

机译：纳米级弥散增强型9Cr马氏体钢熔覆层的生产及性能

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摘要

The 9Cr-ODS martensitic steel claddings were developed by cold-rolling and subsequent heat-treatment. The standard chemical composition is Fe-0.13C-9Cr-2W-0.2Ti-0.35Y_2O_3. The substantially elongated grains formed by cold-rolling turned out to be into equi-axied grains by ferrite to austenite phase transformation at the final heat-treatment. The produced claddings have the tempered martensitic structure and excess oxygen of 0.060 mass percent. The superior tensile and creep rupture strength were shown in the produced cladding, compared with conventional ferritic (PNC-FMS) and even austenitic (PNC316) claddings at higher temperature and extended time. The strength improvement is attributed to finely distributed nano-scale complex oxide. The coarser ferrite grains produced by slow cooling make further improvement in the tensile and creep rupture strength beyond those of tempered martensite at high temperature and longer testing time. The higher excess oxygen content of 0.137 mass percent prevents fine distribution of the oxide particles that lead to inferior high temperature tensile and creep strength.
机译：9Cr-ODS马氏体钢覆层是通过冷轧和随后的热处理而开发的。标准化学成分为Fe-0.13C-9Cr-2W-0.2Ti-0.35Y_2O_3。通过冷轧形成的基本上细长的晶粒在最终热处理时通过铁素体到奥氏体相变而变成等轴晶粒。所生产的覆层具有回火马氏体结构和0.060质量％的过量氧气。与传统的铁素体（PNC-FMS）甚至奥氏体（PNC316）熔覆层相比，在更高的温度和更长的时间下，所生产的熔覆层显示出优异的拉伸强度和蠕变断裂强度。强度的提高归因于精细分布的纳米级复合氧化物。通过缓慢冷却产生的较粗的铁素体晶粒，在高温和更长的测试时间后，其拉伸和蠕变断裂强度超过了回火马氏体，从而进一步提高了抗拉强度和蠕变断裂强度。较高的过量氧气含量为0.137质量％会阻止氧化物颗粒的精细分布，从而导致较低的高温拉伸强度和蠕变强度。

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