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对某新型含有3%Co、3%W和微量B的12%Cr系耐热钢进行调质处理后,常温力学性能及金相组织能满足规范要求,但高温短时持久性能多次出现不合格,对此进行了研究。结果表明,如果B元素大量向晶内迁移,将形成含B量极高的第二相质点,对抑制M23C6和Laves相的粗化,促进MX的细化,稳定析出物,抑制板条状马氏体组织回复的作用明显减弱,晶界强化作用将明显削弱,造成高温短时持久性能下降,其蠕变断裂方式为延性断裂。
After quenching and tempering a certain new type of 12% Cr heat-resistant steel containing 3% Co, 3% W and trace B, the mechanical properties at room temperature and the microstructure meet the specifications, but the long-term high temperature short- Qualified, studied this. The results show that if a large amount of B element migrates into the crystal, a second phase of B-containing particles will be formed, inhibiting the coarsening of M23C6 and Laves phase, promoting the refinement of MX, stabilizing the precipitate, The role of the body tissue repression significantly weakened, the grain boundary strengthening effect will be significantly weakened, resulting in short-term high temperature short-term decline in performance, the creep rupture mode ductile fracture.