Understanding the microstructural evolution of silicide-strengthened hardfacing steels

Understanding the microstructural evolution of silicide-strengthened hardfacing steels
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了解硅化物强化硬面钢的微观结构演变

DOI:
10.1016/j.matdes.2018.09.015
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发表时间:
2019
期刊:
影响因子:
8.4
通讯作者:
Bowden D
Bowden D
中科院分区:
材料科学1区
文献类型:
--
作者:
Bowden D

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正在开发新的粉末处理表面硬化铁基合金,以在要求苛刻的压水反应堆环境中提供高耐磨性和耐腐蚀性。三相不锈钢合金RR 2450是由奥氏体合金Tristelle 5183发展而来的。化学计量的敏感性和这些合金内的相平衡进行了详细的研究,以更好地预测这种化学复杂的合金类内的微观结构的演变。在经历热等静压循环之后,示出RR 2450合金演化出奥氏体、铁素体和新型π-铁硅化物相的三重基体,以及大量铌、钛和铬沉淀物。对不同批次的RR 2450和Tristelle 5183合金之间的大的奥氏体和π-铁硅化物相变化的研究表明,小的化学计量调整允许这些硬面合金被定制以产生用于特定应用的不同微观结构。
New powder-processed hardfacing Fe-based alloys are being developed to provide high wear and corrosion resistance in demanding pressurised water reactor environments. The triplex stainless steel alloy RR2450, developed from the parent austenitic alloy Tristelle 5183, has been created for this purpose. A detailed study into the stoichiometric sensitivity and phase balance within these alloys has been carried out, in order to better predict the microstructural evolution within this chemically complex class of alloys. After undergoing a hot isostatic pressing cycle, the RR2450 alloy is shown to evolve a triplex matrix of austenite, ferrite and a novel π-ferrosilicide phase, alongside numerous niobium, titanium and chromium precipitates. Investigation into large austenite and π-ferrosilicide phase variations between different batches of the RR2450 and Tristelle 5183 alloys has indicated that small stoichiometric adjustments allow these hardfacing alloys to be tailored to produce different microstructures for specific applications.
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