摘要
采用Thermo-Calc软件对超高氮奥氏体钢的伪二元平衡相图进行热力学计算。通过金相显微镜、扫描电镜和XRD,研究了实验用钢的铸态显微组织。结果表明:氮含量为0.9wt%的奥氏体钢的固相线和液相线温度分别为1310、1440℃。氮化物Cr2N的析出温度区间为907~1080℃;碳化物M23C6的析出温度在900℃。超高氮奥氏体钢的铸态组织的基体为奥氏体,析出的氮化物有的呈球状和不规则块状弥散在晶内,有的呈长条状、絮状和块状沿晶界析出。
Thermo-Calc software was used to calculate the pseudo-binary equilibrium phase diagram of ultra-high nitrogen austenitic steel. The as-cast microstructure of the test steel were observed by metallographic microscope, scanning electron microscope and XRD. The results show that the solidus and liquidus temperature of the austenitic steel with a nitrogen content of 0.9 wt% is 1310 ℃ and 1440 ℃, respectively. The precipitation temperature range of the nitride Cr2N is between 907 ℃ and 1080 ℃, and the precipitation temperature of carbide M23C6 is 900 ℃. The matrix of as-cast microstructure of the ultra-high-nitrogen austenitic steel is austenite, and some of the precipitated nitrides are scattered in the form of spheres and irregular blocks, and some are elongated, floc and block precipitating along the grain boundary.
作者
张荣华
石宁
武飚
ZHANG Ronghua;SHI Ning;WU Biao(Key Laboratory of Hebei Province Modern Metallurgy, College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China;Hebei Province Tang Yin Steel Co., Ltd, Tangshan 063000, China)
出处
《热加工工艺》
北大核心
2019年第14期38-39,43,共3页
Hot Working Technology
基金
河北省钢铁联合研究基金项目(E2018209280)
