新聞資訊
Al、Si對(duì)9Cr2WVTa低活化鐵素體-馬氏體鋼力學(xué)性能及鉛鉍腐蝕性能的影響
發(fā)布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時(shí)間：2015-12-09
在 9Cr2WVTa 低活化鐵素體/馬氏體鋼中添加合金元素 Al 和 Si, 利用 SEM, TEM, EPMA 和顯微硬度計(jì)研究了 Al 和Si 對(duì) 9Cr2WVTa 鋼顯微組織、力學(xué)性能、沖擊性能以及耐液態(tài) Pb-Bi 共晶合金(LBE)腐蝕性能的影響.
Al、Si對(duì)9Cr2WVTa低活化鐵素體-馬氏體鋼力學(xué)性能及鉛鉍腐蝕性能的影響EFFECTS OF Al AND Si ON THE MECHANICAL PROPERTIES?AND CORROSION RESISTANCE IN LIQUID Pb-Bi EUTECTIC?OF 9CR2WVTa FERRITIC/MARTENSITIC STEEL
在 9Cr2WVTa 低活化鐵素體/馬氏體鋼中添加合金元素 Al 和 Si, 利用 SEM, TEM, EPMA 和顯微硬度計(jì)研究了 Al 和Si 對(duì) 9Cr2WVTa 鋼顯微組織、力學(xué)性能、沖擊性能以及耐液態(tài) Pb-Bi 共晶合金(LBE)腐蝕性能的影響. 結(jié)果表明, Al 和 Si 縮小9Cr2WVTa 合金的奧氏體相區(qū), 促進(jìn) δ 鐵素體的生成, 且 Al 元素的影響更加明顯. 位于馬氏體與 δ 鐵素體界面的 M23C6碳化物處易產(chǎn)生應(yīng)力集中進(jìn)而形成孔洞, 嚴(yán)重降低9Cr2WVTa合金的室溫沖擊性能, 斷口呈現(xiàn)脆性斷裂特征. 通過(guò)Al和Si的復(fù)合添加, 獲得了具有較好力學(xué)性能和沖擊性能的 9Cr2WVTa 合金, 合金在 550 ℃靜態(tài)液態(tài) Pb-Bi 共晶合金中的腐蝕性能明顯提高, 其原因在于合金內(nèi)層氧化層中形成的 Al 和 Si 的氧化物, 提高了內(nèi)層氧化層的致密性, 降低了合金元素及氧的擴(kuò)散速率, 從而顯著提高合金的耐鉛鉍腐蝕性能.?
9Cr2WVTa steel is one kind of reduced activation ferritic/martensitic (RAFM) steels,?which are considered as the candidate structural materials for the accelerator driven subcritical?system (ADS). Effects of Al and Si on the microstructure, tensile properties, impact toughness and?corrosion behavior in liquid lead–bismuth eutectic (LBE) of 9Cr2WVTa steels were?investigated by SEM, TEM, EPMA and micro hardness tester. The results showed that the addition?of Al and Si promoted the formation of δ-ferrite, and Al was a much stronger ferrite stabilizer than?Si. The presence of δ-ferrite significantly degraded the impact toughness of 9Cr2WVTa steels.?M23C6 carbides were observed to precipitate at the δ-ferrite grain boundaries, and stress?concentrations were created at the carbide/matrix interface, resulting in the intergranular cracking?after deformation. Static corrosion tests were conducted in oxygen-saturated LBE at 550 ℃ for?5000 h to study the effects of Al and Si on the corrosion behaviors in LBE. It is shown that the?addition of Al and Si improved the corrosion resistance in LBE due to that appreciable?enrichments of Al and Si in inner oxide layer increased the compactness of oxide layer and?reduced the diffusion rates of alloy elements and oxygen atoms.?
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