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通过热模拟压缩试验,得到了温度为900~1200℃(温度间隔为50℃)、应变速率为0.1 s-1、应变量为35%条件下时效强化型铁镍基耐蚀合金的应力-应变曲线。不同温度对试验合金的热压缩应力-应变曲线有较大影响。随着变形温度的提高,峰值压缩应力逐渐减小,并且降低的幅度由急变缓。试验后样品的硬度也随变形温度的提高而降低。试验后样品的显微组织均几乎保留着原有的铸态组织形貌,呈明显树枝晶,当试验温度较低时,再结晶程度很小,随着温度的提高,再结晶变得更明显,细小的再结晶晶粒有所增加,但远没有达到完成的地步。当温度为1150和1200℃时,显微照片上可见明显的沿晶裂纹,可能与试验温度过高有关,也可能与单道次变形量太大有关。
Through the thermal simulation compression test, the stress-strain curves of aging-strengthened ferro-nickel-base corrosion-resistant alloy with temperature of 900-1200 ℃ (temperature interval of 50 ℃), strain rate of 0.1 s-1 and strain rate of 35% curve. Different temperatures have a greater impact on the hot compressive stress-strain curve of the test alloy. As the deformation temperature increases, the peak compressive stress decreases gradually, and the amplitude of the reduction decreases from rapid change. After the test, the hardness of the sample also decreases with the increase of the deformation temperature. After the test, the microstructure of the sample retained almost the original as-cast microstructure with obvious dendrites. When the test temperature was low, the degree of recrystallization was very small. As the temperature increased, the recrystallization became more obvious , Small recrystallized grains have increased, but far from the point of completion. When the temperature is 1150 and 1200 ℃, the visible micrograph shows obvious intergranular cracks, which may be related to the test temperature is too high, may also be too much deformation with single pass.