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| Microstructure and Mechanical Property of 1800MPa Grade Low Alloyed Ultra-High Strength Steel for Engineering Machinery |
| LIU Shuang1,2，TANG Guang-bo2，LI Ji-guang1，SUN Hao-yuan1,2，LI Bin1,2 |
1. School of Material and Metallurgy, University of Science and Technology Liaoning, Anshan 114000， Liaoning, China
2. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract A novel 1800MPa grade low alloyed ultra-high strength steel for engineering machinery was designed and its hot rolling was simulated on a pilot hot rolling mill. Effect of different processes, such as process 1 (deformation of 80% + direct-quenching + tempering at 250℃), process 2 (deformation of 90% + laminar cooling to 650℃/1 h + air-cooled + tempering at 250℃) and process 3 (deformation of 90% + air-cooled to 650℃/1 h + air-cooled + tempering at 250℃), on the microstructure and mechanical properties were investigated. The results indicate that the sample of process 1 has a maximum tensile strength of 1816MPa and yield strength of 1473MPa with elongation of 13 percent and reduction of area of 45 percent, the impact energy of room temperature and -40℃(KV2) is 28J and 21J respectively, and the hardness value is 50HRC. It might be from the comprehensive effect of strengthening mechanisms due to the lath martensite+retained austenite, composite micro-alloy carbide and ε-carbide precipitation. Multi-phase microstructure involving lath martensite+upper bainite+retained austenite, lath martensite+acicular ferrite+lamellar pearlite+retained austenite can be obtained by the processes 2 and 3 respectively, and the mechanical properties dramatic decline. The second phase precipitation composite particles are precipitated with Nb,V,Ti.
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Received: 25 April 2013
Published: 20 January 2014
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2014, Vol. 49 
