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| Ti-55531钛合金室温强-塑-韧匹配化热处理工艺研究 |
| Investigation into the Heat Treatment Technology to Enhance the Compatibility among the Tensile Strength, Ductility, and Fracture Toughness of Ti-55531 Alloy |
| Received:October 25, 2023 |
| DOI：10.3969/j.issn.1674-6457.2023.12.009 |
| 中文关键词: 钛合金 固溶处理 微观组织 力学性能 断裂韧度 |
| 英文关键词: titanium alloy solid-solution treatment microstructure mechanical properties fracture toughness |
| 基金项目:山东省军民融合项目(2020****0501) |
| Author Name | Affiliation | | LI Yan-ying | Guizhou Anda Aviation Forging Co., Ltd., Guizhou Anshun 561005, China | | LI Min-xuan | School of Materials Science and Engineering, Harbin Institute of Technology, Shandong Weihai 264209, China | | OUYANG Bin | Guizhou Anda Aviation Forging Co., Ltd., Guizhou Anshun 561005, China | | GE Jin-feng | Guizhou Anda Aviation Forging Co., Ltd., Guizhou Anshun 561005, China | | LIU Cheng | Guizhou Anda Aviation Forging Co., Ltd., Guizhou Anshun 561005, China | | CHANG Xu-sheng | School of Materials Science and Engineering, Harbin Institute of Technology, Shandong Weihai 264209, China | | QI Yu-shi | School of Materials Science and Engineering, Harbin Institute of Technology, Shandong Weihai 264209, China | | ZHANG Yu | School of Materials Science and Engineering, Harbin Institute of Technology, Shandong Weihai 264209, China | | CHEN Gang | School of Materials Science and Engineering, Harbin Institute of Technology, Shandong Weihai 264209, China |
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| 中文摘要: |
| 目的 采用Ti-5Al-5Mo-5V-3Cr-1Zr(Ti-55531)钛合金，研究了不同热处理工艺条件下室温强-塑-韧性能的匹配关系，为满足不同强度、断裂延伸率、断裂韧度综合服役性能要求提供热处理工艺参考。方法 在单相区固溶+时效、双相区固溶+时效2种制度下进行了热处理试验，分析了不同单相区固溶冷却方式(空冷、炉冷)和时效温度、双相区固溶温度等条件下的室温拉伸性能(抗拉强度σb、断裂延伸率A)和断裂韧度KIC，揭示了Ti-55531钛合金室温强度、塑性、断裂韧度的匹配关系。结果 经单相区固溶+空冷+时效处理得到了细片层状次生αs相，随时效温度的升高，αs相尺寸增大，抗拉强度降低，延伸率和断裂韧度升高;经单相区固溶+炉冷+时效处理得到了较粗的α片层，随时效温度从500 ℃升高至600 ℃，α片层尺寸增大，抗拉强度降低，延伸率和断裂韧度升高，但呈现出较高的脆性;随着双相区固溶温度的升高，初生αp相尺寸显著降低，促进后续时效处理过程中析出了更细小的次生αs相，提高了强度，降低了延伸率和断裂韧度。结论 得到了2种能够实现良好强-塑-韧性能匹配的热处理工艺路线:1)850 ℃/1 h固溶后炉冷至600 ℃保温8 h，可得到片层组织以及较高的断裂韧度(KIC=110.01 MPa.m1/2)、良好的强度(σb=1 111 MPa)和断裂延伸率(A=9.69%);2)810 ℃固溶+空冷+600 ℃/3 h时效，可得到初生αp+次生αs相的双态组织，实现了高强度(σb=1 287 MPa)和高断裂延伸率(A=12.76%)，同时断裂韧度达到60.4 MPa.m1/2。 |
| 英文摘要: |
| The work aims to take Ti-5Al-5Mo-5V-3Cr-1Zr (Ti-55531) alloy as the object to study the compatibility among the tensile strength, ductility and fracture toughness at room temperature under different heat treatment conditions, so as to provide a reference for heat treatment process to meet the comprehensive service performance requirements of different strength, elongation at break and fracture toughness. Heat treatment experiments were carried out in two systems:β solid-solution + aging and α+β solid-solution + aging. Tensile properties (including the ultimate tensile strength σb, fracture elongation A) and fracture toughness KIC under the conditions of different β solid-solution cooling modes (air cooling and furnace cooling), aging temperature and α+β solid-solution temperature, etc. were analyzed and the compatibility among the tensile strength, ductility and fracture toughness of Ti-55531 alloy at room temperature was revealed. Β solid-solution followed by air cooling and aging treatment resulted in the formation of fine secondary α lamellar (αs). The αs size increased with the elevation in aging temperature, causing the deterioration in σb and improvement in A and KIC. The β solid-solution followed by furnace cooling and aging treatment produced coarser α lamellar. Elevations in aging temperature from 500 ℃ to 600 ℃ resulted in the rising of α lamellar size and associated decrement in σb and increment in A and KIC. However, these microstructures exhibited high brittleness (A<3%). Increasing the α+β solid-solution temperature reduced the size of primary α particles (αp), thus promoting the precipitation of finer αs during subsequent aging treatment and also resulting in the enhancement in σb and decrement in KIC and A. 2 heat treatment processes that can achieve good compatibility among the tensile strength, ductility and fracture toughness are obtained:1) After a solution treatment of 850 ℃/1 h followed by furnace cooling to 600 ℃ and isothermally holding for 8 h, high KIC=110.01 MPa.m1/2 and moderate σb and A are obtained (σb=1 111 MPa, A=9.69%). 2) After a solid solution treatment under 810 ℃ for 1 h followed by air cooling and aging treatment under 600 ℃ for 3 h, binary structure of primary αp+ secondary αs phases can be obtained and higher compatibility of σband A (σb=1 287 MPa, A=12.76%) is obtained. Meanwhile, the fracture toughness is moderate (KIC=60.4 MPa.m1/2), as remarkably lower than that for the lamellar microstructure. |
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