Abstract: The microstructure evolution and the hardness change rule of GH2036 alloy Φ150 mm bar solution treatment at 1120~1240 ℃ are studied by optical microscope and SEM and HB hardness testing device. Studies have shown that there are two types of rich Cr and Nb-V carbide in the forging microstructure of GH2036 alloy after forging air cooling, most of carbides are backdissolved and the grain size is basically uniform after 1220 ℃solution treatment. The HB hardness number of the alloy is reduced with the increase of heat treatment temperature, but the HB hardness number increases from 185 to 193 at temperature increasing from 1160 to1200 ℃, this is mainly due to the large amount of carbides solving back to matrix.

摘要： 利用光学显微镜、扫描电镜、布氏硬度仪等研究了GH2036合金Φ150 mm棒材在1120~1240 ℃固溶处理的组织演化和硬度变化规律。研究表明，GH2036合金锻后空冷锻材组织中主要存在富Cr和Nb-V两种类型的碳化物，在1220 ℃固溶处理后碳化物大部分回溶，晶粒尺寸基本均匀。合金HB硬度值随热处理温度的升高而降低，但在1160~1200 ℃处理时，硬度随温度的升高，HB硬度值由185升至193，这主要与碳化物大幅度向基体回溶有关。