Progress on yield strength and hydrogen embrittlement of Cu alloyed lightweight steel
With the aggravation of global energy crisis and environmental degradation,the automotive industry has gradually promoted the development mode of vehicle lightweight on the premise of high safety to achieve the goal of low energy consumption and low pollution.Due to the fact that steel materials account for approximately 70%of the total weight of automobiles.Therefore,it is urgent to develop lightweight steel with excellent properties for automo-biles.Currently,Fe-Mn-Al-C lightweight steel,especially austenitic dual phase lightweight steel and austenitic light-weight steel,has become a promising automotive steel due to its excellent comprehensive properties and significant weight reduction.However,like other high-strength steels,the yield strength and hydrogen embrittlement resistance of this steel need to be improved.Focusing on the current research status,it is found that adding Cu element is one of the ideal alloying ideas to improve the above issues.Adding Cu element to steel and reasonable heat treatment pro-cess can achieve the co-precipitation of fine Cu-rich particles and fine κ-particles within the grains,and the precipita-tion of Cu-rich particles can promote the precipitation of κ-particles,which fully utilizes the characteristics of each precipitation phase to improve the comprehensive properties of lightweight steel.The effect and mechanism of Cu on the yield strength and hydrogen embrittlement properties of Fe-Mn-Al-C lightweight steel have been summerized.The following urgent issues need to be addressed in response to the current research status.The interaction law and coupling mechanism of the co-precipitation of Cu-rich particles and κ-carbide particles,as well as their impact on the deformation behavior of steel.The hydrogen trap binding energy of Cu-rich particles and κ-carbides particles and its influence on hydrogen capture sites and hydrogen diffusion rate.The lattice transformation of Cu-rich particles and their relationship with heat treatment process.It will have certain reference value for further improving the compre-hensive properties of Fe-Mn-Al-C lightweight steel and promoting its industrial production and application as soon as possible.
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