B含量对马氏体耐热钢中BN相形态及性能的影响

Effect of B Content on Morphology and Properties of BN Phase in Martensite Heat Resistant Steel

为了研究不同B含量对马氏体耐热钢的微观组织和力学性能的影响,制备了B含量分别为0.012%、0.02%和0.03%的样件,讨论了不同B含量对基体中BN相形貌的影响机制。结果表明:随着B含量的增加,基体中BN相尺寸变大,0.03%B试样中BN相尺寸达到5μm左右;0.012%B试样的抗拉和屈服强度最高;0.012%B试样断口韧窝中BN相为内部碎裂的块状,0.03%B试样中BN相出现薄片层叠堆积球状形态,是由于最初形成BN相的晶核以六方结构形式生长,达到临界尺寸后以B含量较高一侧局部优先生长方式生长,所以提高B含量增大了球形BN的极限尺寸。

In order to study the effect of different B element content on the microstructure and me- chanical properties of martensitic steel microstructure prepared B element content was 0.012%, 0.02% and 0.03% of the ingredients, discussed the different elements in the matrix B influence mechanism BN phase morphology. The results showed that： with the increase of B content, size matrix BN phase is grad- ually increased, 0.03% B BN phase in the sample size to about 5 pro; 0.012% B sample tensile and yield strength of the highest value ; Fracture dimples 0.012% B sample in BN phase is the internal fragmenta- tion of the massive, 0.03% B sample BN phase appears stacked sheets laminated spherical shape, be- cause initially formed hexagonal BN phase nuclei in the form of structural growth, after reaching a critical size in the high B content side to locally grown under preferential growth is improved to increase the con- tent of spherical BN B limits of size.