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用热轧穿孔的方法获得10MnVNb/12Cr双金属复合钢管,通过金相显微镜、环境扫描电镜(ESEM)、能谱仪(EDS)观察界面附近微观组织及元素在界面的分布情况,采用X射线衍射仪和显微硬度计分析界面附近物相及物相变化带来的界面两侧金属硬度起伏,研究不同扩散退火温度对10MnVNb/12Cr界面的影响。结果表明:复合管界面10MnVNb一侧组织为珠光体、马氏体和细小碳化物,12Cr一侧由铁素体、马氏体和少量碳化物组成。随扩散退火温度的升高,界面附近晶粒逐渐粗化,超过1200℃后出现明显过热;Cr元素在界面处发生明显扩散;马氏体峰强增加,碳化物类型由Cr3C2向Cr7C3过渡;退火和碳化物类型转变的综合作用下,界面两侧金属显微硬度出现先下降后上升的趋势。
10MnVNb / 12Cr bimetallic composite steel tube was obtained by hot rolling and perforation method. The distribution of microstructure and elements near the interface was observed by metallographic microscope, environmental scanning electron microscope (ESEM) and energy dispersive spectrometer (EDS). X-ray diffraction The effects of different diffusion annealing temperatures on the interface of 10MnVNb / 12Cr were studied by analyzing the metal hardness fluctuations on both sides of the interface caused by the phase and phase changes in the vicinity of the interface and the microhardness tester. The results show that the microstructure of the interface of 10MnVNb is pearlite, martensite and fine carbide. The 12Cr side is composed of ferrite, martensite and a small amount of carbides. With the increase of the diffusion annealing temperature, the grain near the interface gradually coarsens and overheating occurs when the temperature exceeds 1200 ℃; the Cr element diffuses obviously at the interface; the martensite peak strength increases and the carbide type transitions from Cr3C2 to Cr7C3; And the combined effect of carbide type transformation, the micro-hardness of the metal on both sides of the interface first decreases and then increases.