Effect of Heat Treatment on the Microstructure and Properties of TC4 Titanium Alloy Cooling Structure Prepared by SLM

ZHAO Ping; LIU Peng; WANG Jianyang; LI Huaixue; FAN Hongju; LI Zhuangsheng

doi:10.7512/j.issn.1001-2303.2023.05.07

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Effect of Heat Treatment on the Microstructure and Properties of TC4 Titanium Alloy Cooling Structure Prepared by SLM
Vol. 53, Issue 5, Pages: 54-58(2023)
DOI： 10.7512/j.issn.1001-2303.2023.05.07

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赵萍，刘鹏，王建阳，等.热处理对SLM制备钛合金散热结构组织性能的影响［J］.电焊机，2023，53（5）：54-58.

ZHAO Ping, LIU Peng, WANG Jianyang, et al.Effect of Heat Treatment on the Microstructure and Properties of TC4 Titanium Alloy Cooling Structure Prepared by SLM[J].Electric Welding Machine, 2023, 53(5): 54-58.
赵萍，刘鹏，王建阳，等.热处理对SLM制备钛合金散热结构组织性能的影响［J］.电焊机，2023，53（5）：54-58. DOI： 10.7512/j.issn.1001-2303.2023.05.07.

ZHAO Ping, LIU Peng, WANG Jianyang, et al.Effect of Heat Treatment on the Microstructure and Properties of TC4 Titanium Alloy Cooling Structure Prepared by SLM[J].Electric Welding Machine, 2023, 53(5): 54-58. DOI： 10.7512/j.issn.1001-2303.2023.05.07.

摘要

TC4是一种典型的α+β型双相钛合金，其具有良好成形和焊接性，被广泛应用于航空航天领域。利用金相显微镜、维氏硬度计、X射线衍射仪等设备对激光增材（SLM）制备的TC4钛合金散热结构件热处理前后的显微组织、硬度及相组成进行了试验与分析。结果表明：采用退火工艺时，随着退火温度升高，结构件内部组织发生显著的粗化现象，多数α'相转变为α+β相。其中，退火温度为1 050 ℃时，结构件近内孔和远离内孔的硬度分别为667 HV和690 HV。而920 ℃固溶处理后，结构件合金主要由α'+β相的亚稳态组织构成，结构件近内孔和远离内孔区域的硬度分别为424.8 HV和469.62 HV。经过固溶+时效热处理，结构件合金的亚稳态组织将分解，形成弥散分布的α+β相，此时结构件近内孔和远离内孔区域的硬度均显著降低，分别为371.27 HV和382.64 HV。

Abstract

TC4 is a typical α+β dual phase titanium alloy with good formability, weldability, and comprehensive properties that is widely used in aerospace field. In this paper, the microstructure, hardness, and phase composition of TC4 titanium alloy heat dissipation structural parts prepared by laser alloying (SLM) before and after heat treatment were tested and analyzed by using a metallographic microscope, a Vickers hardness tester, an X-ray diffractometer, and other equipment. The results show that with the increase in annealing temperature, the internal structure of the structural parts undergoes significant coarsening the α' Phase transition to the α+β Phase. When the annealing temperature is 1050 ℃, the hardness of the structure near the inner hole and far from the inner hole is 667 HV and 690 HV, respectively. The structural alloy is primarily composed of α'+β phase after 920 ℃ solution treatment. The hardness of the structure near the inner hole and far from the inner hole is 424.8 HV and 469.62 HV, respectively. After solution+aging heat treatment, the metastable structure of the structural member alloy will be decomposed to form dispersed α+β phase. At this time, the hardness of the structure near the inner hole and far from the inner hole decreased significantly, to 371.27 HV and 382.64 HV, respectively.

关键词

TC4钛合金SLM热处理显微组织硬度

Keywords

TC4 titanium alloySLMheat treatmentmicrostructurehardness

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Microstructure Evolution and Mechanical Properties of Electron Beam Welded Joint of Thick Plate TC4 Titanium Alloy