了解工艺-结构-性能关系，为Laser粉末床熔融添加剂制造的Inconel 718设计更好的热处理
Knowledge of Process-Structure-Property Relationships to Engineer Better Heat Treatments for Laser Powder Bed Fusion Additive Manufactured Inconel 718
摘要：
在通过激光粉末床熔融增材制造（AM）生产并经受标准、直接时效和改进的多步热处理的Inconel 718（IN 718）的微观结构内量化位错结构、化学偏析、{γ ^{\prime}、{γ^{ \prime \prime }}、δ沉淀物和Laves相。此外，还记录了仍附着在构造板上的热处理样本与移除的样本的标准热处理。不同的微观结构对室温强度和断裂伸长率的影响。从这些工艺结构性质关系得到的知识用于设计AM-IN 718的在1020 ℃下15分钟的超固溶线固溶退火，随后在720 ℃下老化24小时热处理，其消除Laves和δ相，保留AM特定位错胞，其显示出通过MC碳化物颗粒稳定，并沉淀出致密的{γ^{ \prime }和{γ^{ \prime \prime }}纳米颗粒群。这种“针对AM-IN 718热处理进行优化”的结果是，相对于锻造/增材制造，然后是行业标准热处理IN 718，其性能更优越：无论完工表面光洁度还是机加工表面光洁度，屈服强度、极限强度和断裂伸长率分别相对增加7/10%、2/7%和23/57%。
英文摘要：
Dislocation structures, chemical segregation, {γ^{\prime}, {γ^{\prime \prime}}, δ precipitates and Laves phase were quantified within the microstructures of Inconel 718 (IN718) produced by laser powder bed fusion additive manufacturing (AM) and subjected to standard, direct aging, and modified multi-step heat treatments. Additionally, heat-treated samples still attached to the build plates vs. those removed were also documented for a standard heat treatment. The effects of the different resulting microstructures on room temperature strengths and elongations to failure is revealed. Knowledge derived from these process structure property relationships was used to engineer a super solvus solution anneal at 1020 degC for 15 minutes, followed by aging at 720 degC for 24 hours heat treatment for AM-IN718 that eliminates Laves and δ phases, preserves AM specific dislocation cells that are shown to be stabilized by MC carbide particles, and precipitates dense {γ^{\prime} and {γ^{\prime \prime}} nanoparticle populations. This 'optimized for AM-IN718 heat treatment' results in superior properties relative to wrought/additively manufactured, then industry standard heat treated IN718: relative increases of 7/10 percent in yield strength, 2/7 percent in ultimate strength, and 23/57 percent in elongation to failure are realized, respectively, regardless of as-built vs. machined surface finishes.
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