【摘要】 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Fe₃（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.更多还原

【Abstract】 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 Fe₃（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.更多还原