热处理态激光立体成形Inconel 718高温合金的组织及力学性能

发布时间：2018-04-14 00:12

本文选题：激光立体成形 + Inconel　；参考：《金属学报》2015年08期

【摘要】：研究了经过高温均匀化固溶处理+中间δ时效处理+双级时效处理的激光立体成形Inconel 718合金的组织及力学性能,并考察了热处理后合金的位错组态.结果表明,由于热处理过程中的再结晶行为,合金组织由沉积态的初始柱状晶转化为等轴晶.Laves相完全固溶,针状δ相以及γ″强化相分别在晶界处以及γ基体上大量弥散析出.激光立体成形Inconel 718合金热处理态的抗拉强度、屈服强度、延伸率以及断面收缩率均达到锻件标准.位错与γ″相的相互作用为位错切割γ″相以及位错绕过γ″相,在位错绕过γ″相的区域,位错密度比位错切割γ″相区域高.由于热处理态δ相尺寸大于锻件,位错会在δ相中发生塞积.碳化物和位错之间也存在强烈的相互作用,通过钉扎和拖曳作用来阻碍位错运动.
[Abstract]:The microstructure and mechanical properties of Inconel 718 alloy formed by laser stereoscopic forming after high temperature homogenization solution treatment and two stage aging treatment were studied. The dislocation configuration of the alloy after heat treatment was also investigated.The results show that due to the recrystallization behavior during heat treatment, the microstructure of the alloy changes from the initial columnar crystal of the deposited state to the complete solution of the equiaxed crystal. The needle-like 未 phase and the 纬 "strengthening phase are dispersed and precipitated at the grain boundary and on the 纬 -matrix, respectively.The tensile strength, yield strength, elongation and cross section shrinkage of Inconel 718 alloy formed by laser stereoscopic forming are up to the standard of forging.The interaction between dislocation and 纬 "phase is dislocation cutting 纬" phase and dislocation bypassing 纬 "phase. The dislocation density is higher than that of dislocation cutting 纬" phase in the region where dislocation bypasses 纬 "phase.Because the size of 未 phase in heat treatment is larger than that of forgings, the dislocation will accumulate in 未 phase.There is also a strong interaction between carbides and dislocations, which hinders dislocation movement through pinning and towing.
【作者单位】：西北工业大学凝固技术国家重点实验室;
【基金】：国家自然科学基金项目51323008,51105311和51271213 国家重点基础研究发展计划项目2011CB610402 国家高技术研究发展计划项目2013AA031103 中国博士后科学基金项目2015M572597 高等学校博士学科点专项科研基金项目20116102110016资助~~
【分类号】：TG132.3

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