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本文利用“铸型移动法”定向结晶工艺研究了DZ38G抗热腐蚀定向凝固涡轮叶片合金的组织和力学性能。该合金含铬量为16wt％,对有害微量元素控制严格。研究结果表明:铸型温度为1500℃,移动速度在6～7mm/min条件下,可以获得按〔001〕平行方向排列的致密挺拔的柱状晶组织。采用1190℃,2hAC+1090℃,2hAC+850℃,24hAC热处理时,可以得到满意的综合性能。在与K38合金具有同样优良的抗热腐蚀条件下,使用温度比K38合金提高40～45℃。
In this paper, the “casting method” directional crystallization process was used to study the microstructure and mechanical properties of DZ38G hot-corrosion-resistant directional solidification turbine blade alloy. The chromium content of the alloy is 16wt%, the strict control of harmful trace elements. The results show that the columnar grain structure of high density and high density arranged in the direction parallel to 〔001〕 can be obtained under the conditions of a mold temperature of 1500 ℃ and a moving speed of 6 ~ 7mm / min. With 1190 ℃, 2hAC +1090 ℃, 2hAC +850 ℃, 24hAC heat treatment, can be satisfied with the overall performance. K38 alloy with the same excellent resistance to hot corrosion conditions, the use of temperature than the K38 alloy increased 40 ~ 45 ℃.