倪磊,刘建华,王安东

• 1:江苏大学材料科学与工程学院

摘要(Abstract)：

研究了不同双时效热处理工艺(一级时效温度为720、770和820℃及时间为1、2、4、8、16和32 h,二级时效温度为620℃及时间为8 h)对激光选区熔化成形的GH4169合金显微组织和力学性能的影响。结果表明：当合金在720℃时效时，晶内γ″相不断析出和长大，当时效时间小于16 h时，晶界处的δ相在形状和数量上均保持不变，当时效时间达到32 h,晶界上的δ相从短棒状转变为长针状，晶内γ″相大量转变为δ相。在770和820℃时效时组织演变与720℃时效类似，但是γ″相向δ相大量转变的起始时间分别提前到了4 h和2 h。不同温度时效处理的试样显微硬度随着时效时间的增加均表现出先增加后降低的趋势。在720℃时效16 h后，合金的硬度达到峰值，为485.6 HV5,而在770和820℃分别时效4 h和2 h后，合金的硬度达到峰值，分别为472.3和458.1 HV5。650℃拉伸性能测试结果表明第一阶段时效工艺分别为720℃×16 h, 770℃×4 h, 820℃×2 h的合金试样的抗拉强度分别为1201、1185和1053 MPa。合金的最佳双时效工艺为720℃时效16 h后炉冷2 h至620℃并保温8 h后空冷。

关键词(KeyWords)： GH4169合金;激光选区熔化;双时效工艺;δ相析出;650℃拉伸性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52175464)

作者(Author): 倪磊,刘建华,王安东

DOI: 10.13289/j.issn.1009-6264.2022-0141

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