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5um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 mechanical 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 gradually increased,0.03％ B BN phase in the sample size to about 5 μm;0.012％ B sample tensile and yield strength of the highest value;Fracture dimples 0.012％ B sample in BN phase is the internal fragmentation of the massive,0.03％ B sample BN phase appears stacked sheets laminated spherical shape,because 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 content of spherical BN B limits of size.
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