The effects of single and double austenitization at 900, 590, 1000 and 1050°C on the microstructure and hardness of quenched and tempered steel 1.4% C – 11.7% Cr (FMU-11) are studied. The metallographic analysis is performed by optical and electron scanning microscopy. The microhardness is measured at low (10 kg) and high (150 kg) loads. The volume content of retained austenite and primary and secondary carbides in the structure is determined. It is shown that double austenitization reduces the size of the carbides and raises the content of retained austenite as compared to single austenitization. Elevation of the austenitization temperature results in lowering of the hardness of the steel.

研究了 900、590、1000 和 1050°C 的单奥氏体化和双奥氏体化对调质钢 1.4% C – 11.7% Cr (FMU-11) 的显微组织和硬度的影响。金相分析通过光学和电子扫描显微镜进行。显微硬度是在低（10 kg）和高（150 kg）载荷下测量的。确定组织中残余奥氏体和一次和二次碳化物的体积含量。结果表明，与单奥氏体化相比，双奥氏体化降低了碳化物的尺寸，提高了残余奥氏体的含量。奥氏体化温度的升高导致钢的硬度降低。