Effects of Annealing and Solution Treatments on the Microstructure and Mechanical Properties of Ti6Al4V Manufactured by Selective Laser Melting.
Effects of Annealing and Solution Treatments on the Microstructure and Mechanical Properties of Ti6Al4V Manufactured by Selective Laser Melting.
复制标题
退火和固溶处理对选择性激光熔化制备的Ti6Al4V微观结构和力学性能的影响
DOI：
10.3390/ma15051978
复制
发表时间：
2022-03-07
期刊：
影响因子：
--
通讯作者：
Kovács T
中科院分区：
文献类型：
--
作者：
Jaber H;Kónya J;Kulcsár K;Kovács T
通过选区激光熔化（SLM）制造的Ti6Al4V（Ti64）合金因形成（α′）马氏体结构，在延伸率低于10%时易失效而广为人知。作为对α′的后续热处理，退火和固溶处理被认为是改善SLM制造的Ti64零件机械性能的好方法。在这项研究中，研究了热处理参数，如温度（850°C和1020°C）和冷却速率（炉冷和水冷）对SLM Ti64结构的微观结构和机械性能的影响。结果表明，SLM制造的Ti64合金的抗拉强度/延伸率由后续热处理决定。实验结果显示，850°C热处理后炉冷可使延伸率（13%）和抗拉强度（屈服强度σy = 932 MPa，抗拉强度σu = 986 MPa）达到最佳组合，其微观结构主要由78.71%的α相和21.29%的β相组成。850°C热处理后水冷的特点是硬度降低，主要形成α相加上α′′相以及少量β相。850°C水冷（HT850WC）的屈服强度和抗拉强度分别约为870 MPa和930 MPa，断裂伸长率为10.4%。1020°C热处理后炉冷的特点是形成α + β层状微观结构。相比之下，1020°C热处理后水冷形成直径约为170 µm的半等轴β晶粒，以及更长的细长α晶粒和篮状α′相。1020°C热处理后炉冷显示出高延伸率，伸长率为14.5%，但抗拉强度较低（屈服强度σy = 748 MPa，抗拉强度σu = 833 MPa）。相反，1020°C热处理后水冷显示出较差的延伸率，伸长率为8.6%，但抗拉强度较高（屈服强度σy = 878 MPa，抗拉强度σu = 990 MPa）。还研究了在550°C时效3小时并炉冷对水冷试样的微观结构和机械性能的影响。研究发现，时效影响Ti6Al4V零件的微观结构，包括β相、α相和α″相的析出以及细长α晶粒的破碎或球化。550°C的时效过程导致抗拉强度增加，延伸率降低。
Ti6Al4V (Ti64) alloys manufactured by selective laser melting (SLM) are well known for their susceptibility to failure at a low ductility of less than 10% due to the formation of an (α′) martensitic structure. Annealing and solution treatments as post-heat treatments of α′ are considered a good way to improve the mechanical performance of SLM-manufactured Ti64 parts. In this research, the effect of heat treatment parameters such as temperature (850 °C and 1020 °C) and cooling rate (furnace and water cooling) on the microstructure and mechanical properties of the SLM Ti64 structure was investigated. It was shown that the tensile strength/ductility of the Ti64 alloy produced by SLM was determined by the post-heat treatment. The experimental results revealed that heat treatment at 850 °C followed by furnace cooling resulted in the best possible combination of ductility (13%) and tensile strength (σy = 932, σu = 986 MPa) with a microstructure consisting mainly of 78.71% α and 21.29% β. Heat treatment at 850 °C followed by water cooling was characterized by a reduction in hardness and the formation of predominantly α plus α′′ and a small amount of β. HT850WC exhibited yield and tensile strengths of about 870 and 930 MPa, respectively, and an elongation at fracture of 10.4%. Heat treatment at 1020 °C and subsequent cooling in the furnace was characterized by the formation of an α + β lamellar microstructure. In contrast, heat treatment at 1020 °C and subsequent water cooling formed semi-equiaxial β grains of about 170 µm in diameter with longer elongated α grains and basket-weave α′. Post-treatment at 1020 °C followed by furnace cooling showed high ductility with an elongation of 14.5% but low tensile strength (σy = 748, σu = 833 MPa). In contrast, post-treatment at 1020 °C followed by water cooling showed poor ductility with elongation of 8.6% but high tensile strength (σy = 878, σu = 990 MPa). The effect of aging at 550 °C for 3 h and cooling in a furnace on the microstructure and mechanical properties of the specimens cooled with water was also studied. It was found that aging influenced the microstructure of the Ti6Al4V parts, including β, α, and α″ precipitation and fragmentation or globularization of elongated α grains. The aging process at 550 °C leads to an increase in tensile strength and a decrease in ductility.
登录
查看更多内容
DOI：
10.1016/j.msea.2011.10.095
发表时间：
2012-01-15
影响因子：
6.4
作者：
Brandl, Erhard;Schoberth, Achim;Leyens, Christoph
通讯作者：
Leyens, Christoph
DOI：
10.1007/978-3-662-46836-4_8
发表时间：
2015-01-01
期刊：
ADVANCES IN METALLIC BIOMATERIALS: TISSUES, MATERIALS AND BIOLOGICAL REACTIONS
影响因子：
--
作者：
Niinomi, Mitsuo;Boehlert, Carl J.
通讯作者：
Boehlert, Carl J.
影响因子：
6
作者：
Lenders, S.;Thoene, M.;Maier, H. J.
通讯作者：
Maier, H. J.
DOI：
10.1016/s0921-5093(97)00778-8
发表时间：
1998-03-15
影响因子：
6.4
作者：
Lutjering, G
通讯作者：
Lutjering, G
影响因子：
4.7
作者：
Kazantseva, N.;Krakhmalev, P.;Ezhov, I.
通讯作者：
Ezhov, I.