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根据冶金部和一机部下达的研制高原机车用7000瓩燃气轮机火焰筒材质的任务,钢铁研究总院和抚顺钢厂共同研制了GH181镍基高温合金。以产品耐用、价格便宜、易于加工成型为原则,确定了合金的主要化学成分为Ni-Cr-W。采用在1000℃下最有效的固溶强化元素钨为强化基体。含铬量高可使合金的抗氧化和耐腐蚀能力改善。以微量元素强化晶界,可使合金在高温下具有良好的综合性能,与国内外广泛使用而性能较高的同类合金比较结果表明(表1,2),GH181合金具有强度高(1000℃σ_b=14.4kg/mm~2)塑性好(室温δ_5=56%)抗蠕变能力强的优点。五个合金中GH181的导热系数最大,膨胀系数最小。总之,GH181的综合性能优于GH128、GH44、GH833和GH22。使用
According to the Ministry of Metallurgy and a machine department issued by the development of plateau locomotive 7000 瓩 gas turbine flame tube material task, the Steel Research Institute and Fushun Steel jointly developed GH181 nickel-based superalloy. To durable products, cheap, easy molding process for the principle to determine the alloy’s main chemical composition of Ni-Cr-W. The most effective solid solution strengthening element at 1000 ° C is used as reinforcing matrix. High chromium content can improve the oxidation resistance and corrosion resistance of the alloy. The strengthening of grain boundaries with trace elements can make the alloy have good comprehensive properties at high temperature. Compared with the widely used and high performance similar alloys both at home and abroad (Table 1 and Table 2), GH181 alloy has the advantages of high strength (1000 ℃ σ_b = 14.4kg / mm ~ 2) good plasticity (room temperature δ_5 = 56%) the advantages of strong creep resistance. Among the five alloys, GH181 has the largest thermal conductivity and the smallest expansion coefficient. In conclusion, the comprehensive performance of GH181 is superior to that of GH128, GH44, GH833 and GH22. use