壁厚和铸造缺陷对ZTA15钛合金组织及性能的影响

韩云飞; 袁兵兵; 孙冰; 刘义辉; 乔海滨; 李渤渤

doi:10.7513/j.issn.1004-7638.2022.06.013

壁厚和铸造缺陷对ZTA15钛合金组织及性能的影响

doi: 10.7513/j.issn.1004-7638.2022.06.013

韩云飞^{1, 2,},
袁兵兵^{1, 2},
孙冰^{1, 2},
刘义辉^{1, 2},
乔海滨^{1, 2},
李渤渤^{1, 2}

1.
洛阳双瑞精铸钛业有限公司, 河南洛阳471000
2.
中国船舶集团有限公司第七二五研究所, 河南洛阳471000

基金项目: 国家重点研发计划项目（2020YFB2008300，2020YFB2008301）。

详细信息

作者简介:
韩云飞，1988年出生，男，河南南阳人，硕士，工程师，研究方向：铸造钛合金，E-mail：337668161@qq.com

中图分类号: TF823
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出版历程
- 收稿日期: 2022-07-11
- 刊出日期: 2023-01-13

Effect of wall thickness and casting defects on microstructure and properties of ZTA15 titanium alloy

Han Yunfei^{1, 2
,},
Yuan Bingbing^{1, 2},
Sun Bing^{1, 2},
Liu Yihui^{1, 2},
Qiao Haibin^{1, 2},
Li Bobo^{1, 2}

1.
Luoyang Sunrui Titanium Precision Casting Co., Ltd., Luoyang 471000, Henan, China
2.
Luoyang Ship Material Research Institute, Luoyang 471000, Henan, China

摘要

摘要: 利用熔模精密铸造技术，制备了圆柱形和哑铃形的ZTA15钛合金试棒（铸态），然后进行热等静压处理（HIP态），采用室温拉伸、显微组织观察、晶粒度评定、X射线探伤、扫描电镜（SEM）及能谱分析等方法，研究了壁厚和铸造缺陷对ZTA15钛合金组织及性能的影响。结果表明：铸态ZTA15钛合金存在残余应力和缩松类铸造缺陷，影响其力学性能，对工程化应用不利；壁厚影响ZTA15钛合金力学性能，壁薄位置晶粒度级别较高，铸态残余应力较大，力学性能反而较低，经热等静压后残余应力得到消除，力学性能稍有提高，为较佳使用状态；缩松类缺陷经热等静压后压实闭合，扩散结合成致密、均匀组织，提高了力学性能，且数据分布集中；夹杂类缺陷对ZTA15钛合金的力学性能不利，尤其是塑性。
- ZTA15钛合金 /
- 熔模精密铸造 /
- 壁厚 /
- 铸造缺陷 /
- 显微组织 /
- 力学性能 /
- 晶粒度
Abstract: In this paper, cylindrical and dumbbell shaped ZTA15 titanium alloy test bars (as cast) were prepared by investment casting technology, and then treated by hot isostatic pressing (HIP). The effects of wall thickness and casting defects on the microstructure and properties of ZTA15 titanium alloy were studied by means of room temperature tensile test, microstructure observation, grain size evaluation, X-ray flaw detection, scanning electron microscope (SEM) and energy spectrum analysis. The results show that as-cast ZTA15 titanium alloy has residual stress and shrinkage casting defects, which affect its mechanical properties and are detrimental to its engineering application. The wall thickness affects the mechanical properties of ZTA15 titanium alloy. The grain size at the thin wall position is finer, but the as-cast residual stress is larger, leading to the lower mechanical properties. After hot isostatic pressing, the residual stress is eliminated, and the mechanical properties are slightly improved, which enable the alloy at better use state. The shrinkage defects are compacted and closed after hot isostatic pressing, and the dense and uniform structure is formed by diffusion bonding, which improves the mechanical properties, and the data distribution is centralized. Inclusion defects are detrimental to the mechanical properties of ZTA15 titanium alloy, especially the plasticity.
- ZTA15 titanium alloy /
- investment casting /
- wall thickness /
- casting defect /
- microstructure /
- mechanical property /
- grain size

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图 1 圆柱形和哑铃形试棒

Figure 1. Cylindrical and dumbbell shaped test bars

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图 2 标准拉伸试样

Figure 2. Standard tensile samples

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图 3 圆柱形试棒铸态显微组织

Figure 3. As-cast microstructure of cylindrical test bar

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图 4 哑铃形试棒铸态显微组织

Figure 4. As-cast microstructure of dumbbell shaped test bar

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图 5 铸态圆柱形试棒晶粒度

Figure 5. Grain size of as-cast cylindrical test bar

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图 6 铸态哑铃形试棒晶粒度

Figure 6. Grain size of as-cast dumbbell shaped test bar

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图 7 铸态试棒X射线探伤底片

Figure 7. X-ray flaw detection negative film of as-cast bar

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图 8 圆柱形试棒HIP态显微组织

Figure 8. HIP microstructure of cylindrical test bar

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图 9 哑铃形试棒HIP态金相显微组织

Figure 9. Microstructure of HIP dumbbell shaped test bar

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图 10 HIP态圆柱形试棒晶粒度

Figure 10. Grain size of HIP cylindrical test bar

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图 11 HIP态哑铃形试棒晶粒度

Figure 11. Grain size of HIP dumbbell shaped test bar

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图 12 HIP态试棒X射线探伤底片

Figure 12. X-ray flaw detection negative film of HIP test bar

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图 13 哑铃形试棒拉伸断口扫描电镜形貌

Figure 13. SEM photos showing fracture appearance of dumbbell tensile sample

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图 14 哑铃形试棒拉伸断口能谱分析结果

Figure 14. Energy spectrum analysis results of dumbbell tensile sample fracture

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表 1 ZTA15钛合金化学成分

Table 1. The chemical compositions of ZTA15 titanium alloy %

主要成分						杂质含量
	Ti	Al	V	Zr	Mo	Fe	Si	C	N	H	O
标准要求	基	5.5～6.8	0.8～2.5	1.5～2.5	0.5～2.0	0.25	0.15	0.13	0.05	0.01	0.16
实测值	基	6.49	2.02	1.60	1.82	0.048	0.018	0.012	0.0066	0.0024	0.093

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表 2 铸态试样室温拉伸力学性能

Table 2. Tensile mechanical properties of as-cast samples at room temperature

试棒形状	R_m/MPa	R_p0.2/MPa	A/%	Z/%
标准要求	≥885	≥785	≥5	≥12
圆柱形	917～992	788～813	4～9.5	11～19
哑铃形	934～987	774～798	3.5～11.5	9～15

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表 3 HIP态试样室温拉伸力学性能

Table 3. Tensile mechanical properties of HIP state samples at room temperature

试棒形状	抗拉强度R_m/ MPa	规定非比例延伸强度R_p0.2/ MPa	断后伸长率A/ %	断面收缩率Z/ %
标准要求	≥885	≥785	≥5	≥12
圆柱形	932～942	813～825	9.5～12.5	17～21
哑铃形	936～947	816～841	4～12	9～22

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