Effects of solid-solution temperature on microstructure and mechanical properties of a novel 2000MPa grade ultra-high-strength steel  

作　　者：Chun-xu Wang Yuan-hang Gao Yong Li Shun Han Shao-zun Liu Peng-jie Zhang 

机构地区：[1]Central Iron and Steel Research Institute,Beijing100081,China

出　　处：《Journal of Iron and Steel Research International》2020年第6期710-718,共9页

摘　　要：A novel 2000 MPa grade ultra-high-strength steel AIR0509 with high fracture toughness and low cost has recently been developed. The effects of solid-solution temperature on the microstructure and mechanical properties of this steel were inves-tigated. The increase in solid-solution temperature first increased and then decreased the values of ultimate strength (UTS) and Charpy U-notch (CUN) energy. The increase in the UTS and CUN values was caused by the dissolution of the primary carbides M6C and MC, while the decrease in both strength and toughness was due to the increase in the prior austenite grain size. Samples that were solid-solution treated at 1000℃ exhibited an optimal combination of strength and toughness with a UTS of 2020MPa, yield strength of 1780MPa, and CUN energy of 68J, as well as a correlative fracture toughness KIC value of about 105MPam1/2.

关 键 词：Ultra-high-strength steel Solid-solution treatment CARBIDE Mechanical property MICROSTRUCTURE 

分 类 号：TG142.1[一般工业技术—材料科学与工程]