电弧微铸锻复合增材制造GH4169D高温合金的显微组织与力学性能
收稿日期: 2022-05-31
修回日期: 2022-11-07
网络出版日期: 2023-02-06
基金资助
国家重点研发计划项目(2019YFB1311103)
Microstructure and Mechanical Properties of GH4169D Superalloy Fabricated by Hybrid Arc and Micro-Rolling Additive Manufacturing
Received date: 2022-05-31
Revised date: 2022-11-07
Online published: 2023-02-06
Supported by
National Key Research and Development Program of China(2019YFB1311103)
GH4169D合金作为一种新型的高力学性能和高稳定性的镍基高温合金，在用于制造高性能复杂结构零件方面具有巨大应用价值，但该合金在电弧增材制造中表现出柱状晶粗大、力学性能各向异性等问题。本工作采用电弧微铸锻复合增材制造(hybrid arc and micro-rolling additive manufacturing，HARAM)技术成形GH4169D高温合金试块，并制定多种热处理制度对所成形的试块进行热处理。运用OM、SEM、EBSD、EDS、XRD、TEM等手段以及室温拉伸实验对合金的微观组织和力学性能进行观测和分析，并与常规电弧熔丝增材制造(wire and arc additive manufacturing，WAAM)方法成形的GH4169D合金进行对比。结果表明，HARAM技术中同步轧制的“微锻”作用能有效地使合金原本粗大的柱状晶发生“破碎”。与常规WAAM方法相比，采用HARAM技术所成形合金的室温抗拉强度提高(X向提高48 MPa，Z向提高90 MPa)，力学性能的各向异性得到有效抑制。均匀化+固溶+双时效热处理有效消除了HARAM技术成形合金中的Laves偏析相，并促进受“微锻”作用的合金组织发生再结晶，使晶粒比未热处理时更为细小均匀，合金的综合力学性能达到最优(抗拉强度和断后延伸率X向为1366 MPa和25.0%，Z向为1354 MPa和24.6%)。
曾立 , 王桂兰 , 张海鸥 , 翟文正 , 张勇 , 张明波 . 电弧微铸锻复合增材制造GH4169D高温合金的显微组织与力学性能[J]. 金属学报, 2024 , 60(5) : 681 -690 . DOI: 10.11900/0412.1961.2022.00264
GH4169D is an age-strengthened nickel-based superalloy designed according to the improved GH4169 superalloy, which has become a remarkable candidate material for aero engines' hot-end components. However, large columnar grains and obvious anisotropy of mechanical properties often occur in this superalloy, which is fabricated by conventional wire and arc additive manufacturing (WAAM). To solve these problems, hybrid arc and micro-rolling additive manufacturing (HARAM) has been proposed. HARAM operates by combining WAAM with the rolling process. Herein, GH4169D superalloy samples were fabricated by WAAM and HARAM. Further, microstructures and mechanical properties of the samples under different heat treatments were investigated. Results show that with micro-rolling applied, large columnar grains became finer. In addition, the tensile strength of HARAM-ed GH4169D was significantly improved compared with WAAM-ed GH4169D (48 MPa in the X direction and 90 MPa in the Z direction), and the anisotropy of mechanical properties of HARAM-ed GH4169D was effectively eliminated. Homogenization plus solution plus double aging heat treatment effectively eliminated Laves segregation phase and induced the recrystallization of HARAM-ed GH4169D, leading to more finer and uniform grains than those without heat treatment, thereby, making the comprehensive properties optimal (the tensile strength and elongation were 1366 MPa and 25.0% in the X direction and 1354 MPa and 24.6% in the Z direction, respectively).
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