采用相分析、径迹显微照像、金相组织观察等技术,研究了40MnB钢高温加热后快冷形成的过饱和固溶硼在再加热时的变化.结果表明,这些过饱和固溶硼在加热时以硼相析出.这是与冷却中析出硼相不同的另一条硼相析出途径.X射线衍射确定硼相主要是Fe_3(C,B).研究了硼相数量、尺寸、析出速度和位置等与加热温度的关系.分析了两条硼相析出途径的异同及联系.
The changes during reheating of the supersaturated solution boron in the40MnB steel previously formed by rapid cooling from elevated temperature weredetected by phase analysis and observed by track microphotography(boron autora-diography)and metallography.It was found that the boron-containing phases areprecipitated during heating from supersaturated solution boron as another differ-ent way of precipitation in comparison with that on cooling.X-ray diffractionshows that the major boron-containing phase is Fe_3(C,B),The correlationbetween its amount,size,precipitating rate,sites and heating temperature wasstudied.The similarities and differences as well as the connection each otherbetween these two precipitation ways were also discussed.
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