Influence of carbon content on precipitated phases and mechanical properties of Nb alloy by vacuum electromagnetic cold crucible meltingOA
Nb-5W-2Mo-1Zr-xC(x=0.04-0.16,wt.%,Nb521 for short)alloys were produced by cold crucible levitation melting(CCLM).The results show that a modest carbon addition(~0.08wt.%)optimizes the strength-ductility balance,whereas further increasing the carbon content yields diminishing strength gains accompanied by a deterioration in ductility.Microstructurally,the low-and medium-carbon alloys are characterized by fine,dispersed NbC and ZrC.In contrast,higher carbon contents promote the formation of irregular,blocky WC precipitates,often accompanied by localized grain-boundary chaining.Mechanical property analysis indicates that strengthening is primarily driven by a combination of solid-solution lattice distortion caused by interstitial carbon and carbide precipitation.The compressive behavior exhibits a strong correlation with the tensile yielding response,serving as an independent validation of the proposed strengthening mechanisms and demonstrating the existence of an optimal carbon range in Nb521 alloys.
Kun Shi;Jia-shuo Zhang;Bo-liang Liu;Hong-yu Liu;Hang Li;Jun-xian Wu;Shi-bing Liu;Wei-chen Qiu;Wei-long Wang;He-wei Qu;Jia-qi Xie
State Key Laboratory of Advanced Casting Technologies,Shenyang Research Institute of Foundry Co.,Ltd.CAM,Shenyang 110022,ChinaState Key Laboratory of Advanced Casting Technologies,Shenyang Research Institute of Foundry Co.,Ltd.CAM,Shenyang 110022,ChinaState Key Laboratory of Advanced Casting Technologies,Shenyang Research Institute of Foundry Co.,Ltd.CAM,Shenyang 110022,ChinaState Key Laboratory of Advanced Casting Technologies,Shenyang Research Institute of Foundry Co.,Ltd.CAM,Shenyang 110022,ChinaUnit 93160 of the People’s Liberation Army,Beijing 100000,ChinaUnit 93160 of the People’s Liberation Army,Beijing 100000,ChinaState Key Laboratory of Advanced Casting Technologies,Shenyang Research Institute of Foundry Co.,Ltd.CAM,Shenyang 110022,ChinaState Key Laboratory of Advanced Casting Technologies,Shenyang Research Institute of Foundry Co.,Ltd.CAM,Shenyang 110022,ChinaState Key Laboratory of Advanced Casting Technologies,Shenyang Research Institute of Foundry Co.,Ltd.CAM,Shenyang 110022,ChinaState Key Laboratory of Advanced Casting Technologies,Shenyang Research Institute of Foundry Co.,Ltd.CAM,Shenyang 110022,ChinaState Key Laboratory of Advanced Casting Technologies,Shenyang Research Institute of Foundry Co.,Ltd.CAM,Shenyang 110022,China
矿业与冶金
Nb alloycarbidesprecipitation strengtheningsolid-solution strengtheningcold crucible levitation melting
《China Foundry》 2026 (4)
P.555-565,11
supported by the Liaoning Province Science and Technology Plan Project(Project No.2023JH2/101700049)。
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