CAJ | 학술논문

研究激光立体成形GH4169高温合金固溶处理后的组织,分析了固溶过程中合金元素的均匀化,并对材料显微硬度的变化做了讨论.结果表明,随固溶温度的升高,材料的晶界越来越清晰,经1000-1170℃固溶处理1 h后材料发生再结晶,当固溶处理温度高于1100℃,有大量孪晶出现,晶粒相比沉积态显著细化,晶粒尺寸约200 μm.合金元素的均匀化在1100℃保温1 h后基本完成.显微硬度测试结果显示,材料的显微硬度值随固溶温度的升高而降低,在固溶温度低于1100℃时减小趋势较快,高于1100℃时减小趋势减缓.显微硬度的变化与材料中γ'和γ"相及δ相的形态和数量有关.1100℃是激光立体成形GH4169合金比较合适的固溶处理温度下限.
연구격광입체성형GH4169고온합금고용처리후적조직,분석료고용과정중합금원소적균균화,병대재료현미경도적변화주료토론.결과표명,수고용온도적승고,재료적정계월래월청석,경1000-1170℃고용처리1 h후재료발생재결정,당고용처리온도고우1100℃,유대량련정출현,정립상비침적태현저세화,정립척촌약200 μm.합금원소적균균화재1100℃보온1 h후기본완성.현미경도측시결과현시,재료적현미경도치수고용온도적승고이강저,재고용온도저우1100℃시감소추세교쾌,고우1100℃시감소추세감완.현미경도적변화여재료중γ'화γ"상급δ상적형태화수량유관.1100℃시격광입체성형GH4169합금비교합괄적고용처리온도하한.
The effects of the solution treatment temperature on the microstructure, the chemical composition homogeneity and the microhardness of laser solid forming GH4169 superalloy were investigated. It is found that the grain boundaries become clearer with increasing of the solution treatment temperature. The recrystallization occurs when the samples are solution treated at 1000-1170 ℃ for 1 h;when the solution treatment temperature/s higher than 1000 ℃, a large number of twin crystals can be observed, and the grains are refined remarkably compared with the as-deposited grains. The chemical homogeneity can be achieved through solution treatment at 1100 ℃ for 1 h. With increasing of the solution treatment temperature, the microhardness fast decreases rapidly, and then slowly when the solution treatment temperature is,above 1100 ℃. The variation of microhardness can be explained based on the precipitation behaviors of γ', γ" and δ phases during the solution treatment. It is concluded that the temperature of 1100 ℃ is the low limit of solution treatment temperature range for laser solid forming GH4169 superalloy.