|
|
|
| Investigation on Microstructure and Mechanical Properties of a Low Alloyed UltraHigh Strength Steel |
| LI Yong1,WANG Chunxu1,TIAN Zhiling1,LIU Xianmin1,ZHANG Jinghai2 |
| 1. Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081,China; 2. Special Steel Branch Special Steel Research & Development Center, Baoshan Iron & Steel Co., Ltd., Shanghai 200940, China |
|
|
|
|
Abstract With ThermoCalc software the equilibrium phases of a low alloyed ultrahigh strength steel 30Cr3 for engine case were studied. By mechanical test, transmission electron microscopic(TEM), scanning electron microscopic (SEM) and XRD observation the performance of 30Cr3 steel was investigated. The results showed that at room temperature the structure components of 30Cr3 steel after equilibrium phase transformation are αFe and carbides (MC、M23C6、M7C3). 30Cr3 steel has good hardenability after normalization,of which microstructure is mainly martensite.During tempering εcarbide is precipitated in martensite laths.The tension strength and yield strength of 30Cr3 steel first rise up with a max.Tension strength of 1870 MPa at 250 ℃, then decline with tempering temperature; the impact energy and fracture toughness decline with increase of tempering temperature.
|
|
Received: 01 January 1900
|
|
|
|
| [1] |
SUN Chao-fan, FANG Yuan, WANG Ya-qing, LIU Wei. Influence of temper rolling reduction rate on microstructure and mechanical properties of TS290 steel[J]. Iron and Steel, 2020, 55(6): 75-79. |
| [2] |
WEI Tong-yu, ZOU De-ning, ZHANG Ying-bo, CHEN Wan-wan. Effect of aluminum on microstructure and properties of high alumina ferritic heat resistant steel[J]. Iron and Steel, 2020, 55(6): 80-83. |
| [3] |
JIANG Yue-yue, WANG Zhao-dong, DENG Xiang-tao. Effect of trace rare earth Ce on martensitic transformation behavior of ultra-high strength low alloy steel[J]. Iron and Steel, 2020, 55(6): 84-90. |
| [4] |
ZHAO Yun-peng, YU Chao, XIAO Hong, WU Zong-he, XU Peng-peng, XIE Hong-biao. Effect of pure iron interlayer on mechanical properties of hot rolled stainless steel clad plate[J]. Iron and Steel, 2020, 55(5): 73-79. |
| [5] |
SHAO Cheng-wei, WANG Jun-tao, ZHAO Xiao-li, HUI Wei-jun. Microstructure and mechanical properties of intercritically annealed Al-contain medium Mn steel[J]. Iron and Steel, 2020, 55(5): 87-93. |
| [6] |
GUO De-ying, LI Dong-tao, ZHANG Xiao-ming, MA Chao, DAI Xin, LIU Yang. Optical structure and thermal and cold properties of different rank coal coke[J]. Iron and Steel, 2020, 55(4): 20-26. |
|
|
|
|
2008, Vol. 43 
