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通过电弧炉及电渣重熔工艺加镁微合金化工业试验,对 GH36铁基合金的机械性能和组织进行了研究。经标准热处理后合金性能检验结果,镁提高了高温持久性能,含0.0040—0.0068%Mg 的电潭合金光滑持久寿命及其塑性成倍增加,缺口持久寿命提高十几倍,消除了持久缺口敏感性。用金相、TEM、SEM 和化学相分析测试组织表明,镁在 GH36铁基合金中富集晶界并进入强化相 M_(23)C_6 和 MC 中,阻止晶界鱼骨状 M_(23)C_6形成,细化、球化一次碳化物 MC,增加颗粒状强化相 M_(23)C_6和 MC 数量。经650℃1000h 长期时效后,镁仍然保持对合金组织和持久性能的有利影响。
The mechanical properties and microstructure of GH36 iron-based alloy were studied by electric arc furnace and ESR process combined with magnesium micro-alloying. After the standard heat treatment alloy performance test results, magnesium to improve the long-term high temperature performance, containing 0.0040-0.0068% Mg of the lanthanum alloy smooth and long life and its plastic doubled, the gap longer life expectancy increased ten times, eliminating the long-lasting gap sensitivity . Microstructure, TEM, SEM and chemical analysis of the microstructure showed that magnesium enriched the grain boundary in the GH36 iron-based alloy and entered the strengthening phase M_ (23) C_6 and MC, preventing the formation of the bone-like M_ (23) C_6 Formation, refinement, spheroidization of a carbide MC, increasing the amount of particulate reinforced phase M_ (23) C_6 and MC. After aging at 650 ° C for 1000 h, magnesium still maintains a beneficial effect on the alloy’s microstructure and ductility.