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| Effect of mass percent of chromium on microstructure and properties of ultra high strength stainless steel |
| JIN Guo-zhong1,2，PEI He-zhong1，LIU Zhen-bao2，LIANG Jian-xiong2，WANG Xiao-hui2,3 |
（1. College of Materials Science and Engineering， Kunming University of Science and Technology， Kunming 650093，Yunnan， China
2. Institute for Special Steels， Central Iron and Steel Research Institute， Beijing 100081， China
3. School of Materials Science and Engineering， University of Science and Technology Beijing， Beijing 100083， China） |
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Abstract The effect of mass percent of Cr on the mechanical properties and microstructure of a new type of ultra strength stainless steel with Cr-Ni-Mo-Co system was studied. The results show that the increase of mass percent of Cr leads to the [Ms]point drop，which results in the increase of austenite mass percent in steel and restrains the precipitation of the Laves phase，resulting in a decrease in the yield strength of the steel. The test steel with 9.5%wt Cr quenched at 1 100 ℃ for 1 h and then refrigerated at －73 ℃ for 8 h. After aging at 540 ℃ for 4 h，the ultimate tensile strength of the steel up to 2 256 MPa. At this time，the intermetallic Laves phase of 5-10 nm was dispersed in the lath martensitic，that the strength reaches the highest value. This study provides basic experimental data for the development of a new type of 2.2 GPa-grade stainless steel materials which has broad applications in aerospace and aerospace fields.
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Received: 19 March 2018
Published: 11 October 2018
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2018, Vol. 53 
