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采用Gleeble-1500热模拟试验机对新型镍基粉末高温合金FGH98Ⅰ进行了单向热压缩变形试验,研究了其在变形温度为950～1150℃,应变速率为0.0003～1s-1条件下的热变形行为,建立和对比了不同应变量下的应变速率敏感因子m图和功率耗散效率因子η图,并对热加工图进行了组织验证。结果表明:合金的流变应力随着变形温度的升高和应变速率的降低而降低;不同应变量下的η图与m图相似,随着应变量的增大,峰区的η与m值逐渐升高;当真应变为0.5时,在变形温度为1050℃,应变速率为0.0003s-1条件下,η与m达到峰值,分别为40%和25%,合金发生了动态再结晶,晶粒细化且无内裂纹。该结果为FGH98Ⅰ合金实际热加工工艺的优化提供了理论依据。
The uniaxial hot compression deformation test of a new type of nickel-base powder superalloy FGH98Ⅰ was carried out by using Gleeble-1500 thermal simulator. The hot deformation of FGH98Ⅰ was studied at deformation temperature of 950 ~ 1150 ℃ and strain rate of 0.0003 ~ 1s-1 Behavior, established and compared the strain rate sensitivity factor m map and power dissipation efficiency factor η map under different strain quantities, and the heat processing diagram was verified. The results show that the flow stress of the alloy decreases with the increase of the deformation temperature and the decrease of the strain rate. The η diagrams and the m diagrams of the alloys with different strain are similar. With the increase of the strain, the η and m values Η and m peaked at a strain rate of 0.0003s-1 at a strain of 1050 ℃ and 40% at a true strain of 25%, respectively. The dynamic recrystallization of the alloy occurred. The grains Refined and no internal cracks. The results provide theoretical basis for the optimization of the actual hot working process of FGH98I alloy.