醫用鎳鈦合金的制備與熱壓縮變形行為

王臻; 徐效文; 王快社; 王文

doi:10.13374/j.issn2095-9389.2019.02.011

醫用鎳鈦合金的制備與熱壓縮變形行為

doi: 10.13374/j.issn2095-9389.2019.02.011

1.
中南大學生物醫學工程系長沙 410083
2.
西安建筑科技大學冶金工程學院西安 710055

基金項目:

甘肅省科技重大專項計劃"鎳產業鏈關鍵技術開發與產業化"資助項目 17ZD2GC011

詳細信息

通訊作者:
徐效文, E-mail: xuxiaowen@csu.edu.cn

中圖分類號: TG174
計量
- 文章訪問數: 1147
- HTML全文瀏覽量: 565
- PDF下載量: 20
- 被引次數: 0
出版歷程
- 收稿日期: 2018-06-07
- 刊出日期: 2019-02-01

Preparation and hot compression deformation of biomedical Ni-Ti alloy

1.
Department of Biomedical Engineering, Central South University, Changsha 410083, China
2.
School of Metallurgy Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

More Information

Corresponding author: XU Xiao-wen, E-mail: xuxiaowen@csu.edu.cn

摘要

摘要: 采用真空感應熔煉法制備了醫用Ti-50. 7%Ni合金(原子數分數), 測試了鑄態合金的成分、相變點、微觀組織和硬度, 并采用Gleeble-3800熱模擬實驗機在變形溫度750~950℃、應變速率0. 001~1 s-1, 應變量為0. 5的條件下對Ni-Ti合金進行高溫壓縮變形, 分析其流動應力變化規律, 建立了高溫塑性變形本構關系和熱加工圖.結果表明: 當變形溫度減小或應變速率增大時, Ni-Ti合金的流動應力會隨之增大.應變速率為1 s^-1時, 合金的真應力-真應變曲線呈現出鋸齒狀特征.根據熱加工圖, 獲得了Ni-Ti合金的加工安全區和流變失穩區, 進而確定其合理的熱變形溫度范圍為820~880℃, 真應變速率低于0. 1 s^-1.從而為制定鎳鈦合金的鍛造工藝參數提供理論和數據基礎.
- 鎳鈦記憶合金 /
- 熱壓縮變形 /
- 應變曲線 /
- 熱加工圖
Abstract: A Ti-50. 7% Ni (atomic fraction) shape alloy was prepared by vacuum induction melting under dynamic argon atmosphere. By analyzing the composition, deformation temperature, microstructure, and hardness of the as-cast Ni-Ti shape alloy in this study, it was found that the properties of the as-cast Ni-Ti alloy met the medical standard. To analyze the variation law of the flow stress, the flow stress of the compression deformation for as-cast Ni-Ti alloy was studied by high-temperature compression with a Gleeble-3800 simulated machine within a deformation temperature range of 750-950 ℃, strain rate range of 0. 001-1. 0 s^-1, and strain level of 0. 5. To analyze the relationship between variables in the hot deformation process of as-cast Ni-Ti alloy, a constitutive equation based on dynamic material model was established. To determine the reasonable range of hot working conditions for as-cast Ni-Ti alloy deformation, hot processing maps under different hot deformation conditions were set up. The results show that when the deformation temperature decreases or strain rate increases, the flow stress of as-cast Ni-Ti alloy increases. This phenomenon shows that the main factors affecting the flow stress of as-cast Ni-Ti alloy are deformation temperature and strain rate. When the strain rate is 1. 0 s^-1, the true stress-true strain curves of as-cast Ni-Ti alloy exhibits a zigzag feature. This is mainly attributed to the alternation between hardening and softening during deformation. According to the hot processing maps under different hot deformation conditions, the processing zone and unstable hot deformation region of the as-cast Ni-Ti alloy were obtained. Then, the best temperature range of hot deformation is determined as 820-880 ℃, and the true strain rate is less than 0. 1 s^-1. This study provides a theoretical and data basis for the development of forging process parameters of Ni-Ti alloy.
- Ni-Ti alloy /
- hot compression /
- strain curves /
- hot processing map

HTML全文

圖 1 Ni-Ti鑄錠的鑄態組織. (a) 邊緣部位; (b) 中心部位

Figure 1. As-cast microstructure of the Ni-Ti ingot: (a) at the edge; (b) at the center

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圖 2 沿鑄錠直徑方向的顯微硬度分布

Figure 2. Microhardness distribution of the ingot along the diameter

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圖 3 不同應變速率下, 不同變形溫度時的真應力-真應變曲線. (a) 0.001 s^-1; (b) 0.01 s^-1; (c) 0.1 s^-1; (d) 1 s^-1

Figure 3. True stress-true strain curve at different deformation temperatures under different strain rates: (a) 0.001 s^-1; (b) 0.01 s^-1; (c) 0.1 s^-1; (d) 1 s^-1

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圖 4 Ni-Ti合金的穩態應力與應變速率的關系. (a) $\ln \dot \varepsilon - \sigma $; (b) $\ln \dot \varepsilon - \ln \sigma $

Figure 4. Relationship between steady state stress and strain rate of Ni-Ti alloy: (a) $\ln \dot \varepsilon - \sigma $; (b) $\ln \dot \varepsilon - \ln \sigma $

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圖 5 Ni-Ti合金的$\ln \left[ {\sinh \left( {\alpha \sigma } \right)} \right] - \ln \dot \varepsilon $關系曲線(a) 和$\ln \left[ {\sinh \left( {\alpha \sigma } \right)} \right] - {T^{ - 1}}$關系曲線(b)

Figure 5. Relation curve of $\ln \left[ {\sinh \left( {\alpha \sigma } \right)} \right] - \ln \dot \varepsilon $ of Ni-Ti alloy (a) and relation curve of $\ln \left[ {\sinh \left( {\alpha \sigma } \right)} \right] - {T^{ - 1}}$ of Ni-Ti alloy (b)

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圖 6 ln Z與ln[sinh(ασ)]關系曲線

Figure 6. Plot of ln Z versus ln[sinh(ασ)]

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圖 7 預測應變曲線與實測應變曲線的比較

Figure 7. Comparison between predicted and measured flow curves

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圖 8 不同應變量下Ni-Ti合金的熱加工圖. (a) 0.1; (b) 0.2; (c) 0.3; (d) 0.4

Figure 8. Processing maps for Ni-Ti alloy at different strains: (a) 0.1; (b) 0.2; (c) 0.3; (d) 0.4

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表 1 本文醫用Ni-Ti合金鑄錠的化學成分(質量分數)

Table 1. Chemical compositions of the medical Ni-Ti alloy in this study

Ni	C	N	H	O	Ti
55.69	0.069	0.010	0.001	0.045	余量

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表 2 DSC法測定的鑄錠相變溫度

Table 2. Ingot phase transition temperature measured by DSC method

馬氏體相變終止溫度，M_f/℃	馬氏體相變峰值溫度，M_p/℃	馬氏體相變開始溫度，M_s/℃	奧氏體相變開始溫度，A_s/℃	奧氏體相變峰值溫度，A_p/℃	奧氏體相變結束溫度，A_f/℃
-49	-32	-16	-16	-5	9

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表 3 Ni-Ti形狀記憶合金在不同變形條件下的流動應力值

Table 3. Rheological stress and strain values of Ni-Ti alloy under differ-ent deformation conditions

應變量	應變速率/s^-1	不同溫度下的流動應力/MPa
應變量	應變速率/s^-1	750℃	800℃	850℃	900℃	950℃
0.1	0.001	85.146	62.551	48.931	42.566	33.268
	0.010	146.85	115.86	88.264	72.478	68.129
	0.100	243.55	180.24	158.4	127.82	100.34
	1.000	326.47	285.74	234.88	203.07	169.07
0.2	0.001	81.899	61.742	48.776	40.358	31.135
	0.010	143.9	112.64	85.382	70.403	64.094
	0.100	237.88	178.41	157.04	123.73	97.844
	1.000	309.36	265.71	228.3	198.52	168.68
0.3	0.001	78.147	60.99	46.518	38.79	29.61
	0.010	141.94	108.84	80.703	67.432	59.946
	0.100	224.64	178.59	151.53	119.42	92.211
	1.000	289.45	253.92	223.79	192.29	163.3
0.4	0.001	76.852	58.794	45.453	37.331	28.22
	0.010	134.4	107.74	78.287	67.808	56.722
	0.100	214	180.08	150.86	115.87	90.351
	1.000	285.38	247.41	223.23	188.73	159.85

下載: 導出CSV

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