Effect of Mo and cold forging deformation on strength and ductility of cobalt-based alloy L605

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外文摘要：Mo element was added to cobalt-based alloy L605,and cold forging deformation was performed.The effects of the addition and cold forging deformation on the microstructure and mechanical properties of the alloy were studied by thermodynamic calculation,electron backscatter diffraction,transmission electron microscopy,and X-ray diffraction.The stacking fault energy(SFE)of the alloy decreased after the addition,and the formation of stacking faults and intersections were promoted to improve the strength and hardness.The tensile strength of the alloy with Mo increased from 1190 to 1702 MPa after 24％cold deformation,producing significant work hardening.The strengthening mechanism is strain-induced martensitic transformation(SIMT)and deformation twinning.The alloy,combined with Mo and after 24％deformation,had both high strength and ductility in comparison with the original cobalt-based alloy L605.This is attributed to the lower SFE which caused the increase in stacking fault density.During the tensile process,the ε-hcp phase was easily generated at the stacking fault to reduce the stress concentration and increase the ductility.Controlling SIMT by adjusting the density of stacking faults can improve the mechanical properties of cobalt-based alloys.The ε-hcp phase,the interaction between deformation twins and dislocations,and the interaction between e-hcp phases during cold forging deformation caused local stress concentration,lowering ductility and toughness.

外文关键词：

Cobalt-based alloyStacking fault energyStrain-induced martensitic transformationDeformation twinCold forging deformation

作者：

Zhong-lin Wang、Zhi-hua Gong、Quan Li、Han-sheng Bao

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作者单位：

School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014017,Inner Mongolia,China

Institute of Special Steels,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China

基金：

Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous RegionInner Mongolia Natural Science Foundation

项目编号：

NJYT231152022MS05039

出版年：

2024

DOI：

10.1007/s42243-023-01159-1

钢铁研究学报(英文版)

钢铁研究总院

钢铁研究学报(英文版)

CSTPCD

影响因子：0.584

ISSN：1006-706X

年,卷(期)：2024.31(7)