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对用于先进超超临界机组锅炉的候选高温合金Alloy 263在固溶处理、沉淀硬化处理和750℃时效3 000 h过程的组织演变行为进行了研究并分析了其组织的稳定性.结果表明:在固溶处理状态下的Alloy 263组织晶粒度为4~5级,较多的一次(Ti、Mo)C弥散分布于γ基体上,且γ′相形核于晶内;沉淀硬化处理主要在晶内共格析出颗粒状γ′相,在晶界析出大量的M23C6;在750℃长期时效条件下,γ′相发生Ostwald熟化,且与基体的错配度增加,M23C6和MC继续析出与长大;在时效1 000 h下基本处于稳定状态,当时效为3 000 h时,有针状η相生成;高温合金Alloy263在750℃下具有良好的组织稳定性.
The microstructure evolution of candidate superalloy Alloy 263 used in the advanced ultra-supercritical boilers was investigated in the solution treatment, precipitation hardening treatment and aging at 750 ℃ for 3 000 h.The stability of the alloy was analyzed.The results show that: In the solution treatment, the grain size of Alloy 263 is in the range of 4 to 5, and the more (Ti, Mo) C is dispersed on the γ matrix and the γ ’phase is nucleated in the crystal. The precipitation hardening mainly occurs in In addition, a large amount of M23C6 was precipitated at the grain boundary, and the Ostwald ripening occurred in the γ ’phase at 750 ℃ for a long time, and the mismatch with the matrix increased. The M23C6 and MC continued to separate out from the long In the aging time of 1 000 h, it is basically in a steady state. When the aging time is 3000 h, a needle-like η phase is formed. The high-temperature alloy Alloy263 has good microstructure stability at 750 ° C.