摘要
对固溶态A286合金实施不同形变量的拉拔变形,并进行不同制度时效处理。采用金相显微镜、扫描电镜和力学试验机等设备,系统分析比较了不同形变量及时效制度下合金的晶粒形态、析出相和拉伸性能的变化情况。结果表明:时效不改变合金的晶粒形态;当变形量低于30%时,合金组织为等轴晶,孪晶较多,形变量超过35%时,组织开始纤维化,晶内出现明显变形特征;对于同一时效制度,以弥散的γ'相和粒状碳化钛、碳化铬为主的析出相的数量随形变量的增大而增加,合金的抗拉强度也随之提高;对于同一形变条件,经650℃和680℃两种温度时效后γ'相呈方型,其尺寸随温度升高而增大,680℃+650℃两段时效后γ'相变成更为稳定的球型,且两段时效后的析出相数量较多,抗拉强度最高。
Different cold-drawing deformation and aging treatments were carried out on a solid-solution treated A286 superalloy.The changes of grain morphology,precipitated phase and tensile properties of the alloy under different deformation and aging conditions were systematically analyzed and compared by means of metallographic microscope,scanning electron microscope( SEM) and mechanical testing machine.The results show that the aging does not change the grain morphology of the alloy,and when the deformation is less than 30%,the microstructure of the alloy is equiaxed with many twins; while when the deformation is higher than 35%,the microstructure begins to become fibrosis with obvious deformation traces inside the grains.For the same aging condition,the amount of dispersed γ' phases mainly composed of granular titanium carbide and chromium carbide increase with the increase of deformation,and the tensile strength also increases.For the same deformation condition,the size of cubical γ' phase increases gradually when the aging temperature increases from 650 ℃ to 680 ℃,while after two-stage aging at 680 ℃ and 650 ℃,the γ' phase turns into stable spherical form,the amount of precipitated phases is much more,and the tensile strength is the highest after two-stage aging.
引文
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