Effect of Quenching Process on Microstructures and Mechanical Properties of Fe-0.9Mn-0.5Cr-2.4Ni-0.5Mo-C Steel

被引:10
作者
Chen, Jie [1 ]
Li, Changsheng [1 ]
Jin, Xin [1 ]
Chen, Liqing [1 ]
Fang, Lei [2 ]
机构
[1] Northeastern Univ, State Key Lab Rolling Technol & Automat, Shenyang 110819, Liaoning, Peoples R China
[2] Nanjing Iron & Steel Co Ltd, Nanjing 210035, Jiangsu, Peoples R China
基金
中国国家自然科学基金; 高等学校博士学科点专项科研基金;
关键词
-60 degrees C Charpy impact; microstructures; quenching process; steels for hydropower station; yield strength; DUCTILE-BRITTLE TRANSITION; CARBON MICROALLOYED STEEL; STRENGTH PLATE STEELS; LATH MARTENSITE; 9CR-1MO STEEL; AUSTENITE; TOUGHNESS; TRANSFORMATION; DIFFRACTION; BAINITE;
D O I
10.1007/s11665-018-3163-7
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
To develop an appropriate quenching process to produce Fe-0.9Mn-0.5Cr-2.4Ni-0.5Mo-C steel, the microstructures and mechanical properties of this steel were investigated under the direct quenching and tempering (DQT) and the direct quenching, reheated quenching and tempering (DQQT) heat treatment processes. The microstructure of the DQQT specimen was basically tempered sorbite with spherical precipitates, while quite a bit of tempered martensite was in the DQT specimen with dispersive nanoscaled precipitates. The yield strengths of the DQT and DQQT specimens were 1154 and 955 MPa, respectively. The yield strength of the DQT specimen was higher than that of the DQQT specimen because of its finer grain size, higher density of dislocations and dispersed precipitates. The DQQT specimen had spherical precipitates, which hindered the propagation of the crack. Moreover, the high-angle grain boundaries in the DQQT specimen took a higher proportion. Therefore, the Charpy impact values of DQT and DQQT specimens at - 60 A degrees C were 38 and 75 J, respectively. Consequently, the mechanical properties of the Fe-0.9Mn-0.5Cr-2.4Ni-0.5Mo-C steel, which met the standard of 1000 MPa grade steel plate for hydropower station, were acquired by the DQQT process.
引用
收藏
页码:1505 / 1513
页数:9
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