【摘要】 用增材制造激光选区熔化工艺制备典型的高温合金GH4169并在25～650℃测试其拉伸性能，用扫描电镜和透射电镜等手段表征其微观组织和拉伸变形行为，研究了测试温度对其力学性能的影响和变形机制。结果表明，在25℃、600℃和650℃测试这种合金的拉伸性能，其拉伸曲线较为光滑，在450～550℃测试的曲线呈锯齿状。随着测试温度的提高合金的抗拉强度从1458 MPa降低到1228 MPa，屈服强度则从1234 MPa下降到1051 MPa。SLM GH4169合金的拉伸强度与温度之间的关系大致是线性的。在25～450℃测试，合金中的强化相阻碍位错运动产生了强化作用；在550～650℃滑移为主要变形方式，δ相不利于拉伸性能。更多还原

【Abstract】 The typical superalloy GH4169 was prepared by selective laser melting(SLM), and then subjected to appropriate post-heat treatments, afterwardsits tensile properties was assessed in temperature range 25～650 ℃. The microstructure evolution, tensile behavior at different temperatures were examinedby scanning electron microscopy and transmission electron microscopy, and the corresponding deformation mechanism of SLM GH4169 alloy was disscussed. The results show that the tensile curves of the of SLM GH4169 alloy are monotonic and smooth at 25 ℃, 600 ℃ and 650 ℃, but those at 450～550 ℃ are sawtooth-like. With the increasing test temperature, the tensile strength and yield strength of the SLM GH4169 alloy decreases from 1458 MPa to 1228 MPa and 1234 MPa to 1051 MPa respectively. The relationship between tensile strength and temperature of the SLM GH4169 is roughly linear with an error is less than 2%. The strengthening phases may obstruct the dislocation movement and plays a certain strengthening role in the temperature range 25～450 ℃. While in the range 550～650 ℃,slip bands may be the main deformation mode, and δ phases also has an adverse effect on tensile properties.更多还原