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本文采用多种实验手段对Fe_(65)Cr_(18)Mo_2Si_1B_(14)和 Fe_(62)Cr_18)Mo_2Si_1B_(17)单辊快淬带的结构和性能进行了综合的考察。XRD、TEM和DTA检测结果表明快淬带完全为非晶态,但由TEM还观察到非晶基体中分布着几十纳米大小,衬度较深,呈颗粒状的非晶第二相,第二相的数量随硼含量的增加而增加。相应的磁矩测试、磁滞迴线和Mssbauer谱显示非晶态由磁性能不同的相所组成,在室温下,少量铁磁相分散在呈顺磁性的基体中,并表现出单畴颗粒的高矫顽力。铁磁相的数量也随硼含量的增加而增加。快淬带未经退火即已脆化,增加硼含量既提高非晶形成能力及非晶态总体无序程度和稳定性又明显加剧脆性。分析表明,快淬过程中早期过冷液体硼的偏聚导致非晶第二相的形成。相分离对淬火带的磁学和力学性能都有重要影响。
In this paper, the structure and properties of Fe 65 Cr 18 Mo 2 Si 1 B 14 and Fe 62 Cr 18 single MoxSi 1 B 17 single-roll quenching belts were comprehensively investigated. The results of XRD, TEM and DTA show that the quenched zone is completely amorphous. However, the TEM shows that the amorphous second phase is graded with dozens of nanometers size and darker particles. The amount of two phases increases with increasing boron content. The corresponding magnetic moment tests, hysteresis loops and Mssbauer spectra show that the amorphous phase consists of phases with different magnetic properties. At room temperature, a small amount of the ferromagnetic phase is dispersed in the paramagnetic matrix and exhibits monodomain High coercivity. The number of ferromagnetic phases also increases with boron content. Rapid quenching zone has not been annealed that has embrittled, increasing the boron content both to improve the ability of amorphous formation and amorphous overall degree of disorder and stability and significantly increased brittleness. The analysis shows that the segregation of boron in the early supercooled liquid during quenching leads to the formation of amorphous second phase. Phase separation on the quenching zone have a significant impact on the magnetic and mechanical properties.