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ZG35Cr2 5Ni12奥氏体耐热铸钢经固溶时效后的显微组织由初晶奥氏体、共晶碳化物 ,以及在奥氏体基体上时效析出的二次碳化物组成 ;使用 3.5a(年 )后二次碳化物增多 ,共晶碳化物附近的“无析出区”消失 ,并在许多共晶碳化物内部形成黑斑组织。研究表明 ,黑斑组织是富含稀土元素的氮碳化物ε (Cr ,Fe) 2 (N ,C)相 ,是在长期高温过程中通过消耗共晶碳化物形成的
ZG35Cr2 5Ni12 austenitic heat-resistant cast steel after solution aging microstructure consists of primary austenite, eutectic carbide, and secondary austenite precipitated on the austenite matrix composition; the use of 3.5a ( Year) secondary carbides increased, eutectic carbide near the “no precipitation zone” disappear, and in many eutectic carbide formation within the organization of dark spots. Studies have shown that the dark spot is the ε (Cr, Fe) 2 (N, C) phase of rare earth element-rich nitrocarburized carbides that are formed by consuming eutectic carbides during long-