中国激光, 2018, 45 (3): 0302008, 网络出版: 2018-03-20
热变形条件对激光增材制造TC18钛合金组织及变形行为的影响 
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Effects of Thermal Deformation Conditions on Microstructures and Deformation Behaviors of Laser Additive Manufactured TC18 Titanium Alloys
图 & 表
图 1. (a)取样方向示意图;(b)热变形过程示意图
Fig. 1. (a) Schematic of sampling direction; (b) schematic of thermal deformation process
图 2. 不同变形温度下的流变应力-应变曲线图。(a) 750 ℃;(b) 800 ℃;(c) 850 ℃;(d) 900 ℃
Fig. 2. Flow stress-strain curves under different deformation temperatures. (a) 750 ℃; (b) 800 ℃; (c) 850 ℃; (d) 900 ℃
图 3. 不同热变形条件下的(a)峰值流变应力和(b)流变应力软化值
Fig. 3. (a) Peak flow stress and (b) softness value of flow stress under different thermal deformation conditions
图 4. 峰值流变应力和应变速率之间的关系。 (a) lnε·-lnσ;(b) lnε·-σ
Fig. 4. Relationship between peak flow stress and strain rate. (a) lnε·-lnσ; (b) lnε·-σ
图 5. 关系曲线。(a) lnε·与ln[sinh(ασ)];(b) ln[sinh(ασ)]与T-1
Fig. 5. Relationship curves. (a) lnε·-ln[sinh(ασ)]; (b) ln[sinh(ασ)]-T-1
图 6. 基于Prasad准则的热加工图。(a) ε=0.1;(b) ε=0.2;(c) ε=0.3;(d) ε=0.4;(e) ε=0.5;(f) ε=0.6
Fig. 6. Thermal working maps based on Prasad criterion. (a) ε=0.1; (b) ε=0.2; (c) ε=0.3; (d) ε=0.4; (e) ε=0.5; (6) ε=0.6
图 7. 不同热变形条件下的显微组织。(a)沉积态;(b) ε·=0.001 s-1,T=750 ℃;(c) ε·=0.001 s-1,T=800 ℃;(d) ε·=0.001 s-1,T=850 ℃;(e) ε·=0.001 s-1, T=900 ℃
Fig. 7. Microstructures under different thermal deformation conditions. (a) As-deposited state; (b) ε·=0.001 s-1,T=750 ℃; (c) ε·=0.001 s-1, T=800 ℃; (d) ε·=0.001 s-1, T=850 ℃; (e) ε·=0.001 s-1, T=900 ℃
图 8. 在ε·=0.001 s-1,T=900 ℃条件下变形后的试样EBSD测试结果
Fig. 8. EBSD test results of deformed specimen under condition of ε·=0.001 s-1 and T=900 ℃
表 1热模拟实验工艺方案
Table1. Process scheme in thermal simulation experiment
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王宏芳, 田象军, 程序, 刘栋, 王华明. 热变形条件对激光增材制造TC18钛合金组织及变形行为的影响[J]. 中国激光, 2018, 45(3): 0302008. Wang Hongfang, Tian Xiangjun, Cheng Xu, Liu Dong, Wang Huaming. Effects of Thermal Deformation Conditions on Microstructures and Deformation Behaviors of Laser Additive Manufactured TC18 Titanium Alloys[J]. Chinese Journal of Lasers, 2018, 45(3): 0302008.
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