Static and Fatigue Characteristics of Heat-Treated Ti-6Al-3Mo-2Zr-2 Sn-2Nb-1.5Cr-0.1Si Alloy

被引：8
作者：
Elshaer, Ramadan N. [1 ]
Abdelhameed, M. [2 ]
Ibrahim, Khaled M. [3 ]
El-Shennawy, M. [4 ]
Sobh, A. [4 ]
机构：
[1] Tabbin Inst Met Studies, Cairo, Egypt
[2] Petrojet Co, Cairo, Egypt
[3] Cent Met R&D Inst, Cairo, Egypt
[4] Helwan Univ, Fac Engn, Cairo, Egypt
来源：
METALLOGRAPHY MICROSTRUCTURE AND ANALYSIS | 2022年 / 11卷 / 03期
关键词：
TC21; Ti-alloy; Solution treatment; Aging; Microstructure; Tensile; Fatigue; HIGH-CYCLE-FATIGUE; TC21; TITANIUM-ALLOY; MECHANICAL-PROPERTIES; CRACK INITIATION; TI-6AL-4V ALLOY; MICROSTRUCTURE; BEHAVIOR; DEFORMATION; PROPAGATION; LIMIT;
D O I：
10.1007/s13632-022-00856-9
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Static and fatigue characteristics of Ti-6Al-3Mo-2Zr-2Sn-2Nb-1.5Cr-0.1Si (TC21 Ti-alloy) in as-received and heat-treated conditions were investigated at ambient temperature. Two solution treatment cycles were applied on as-received TC21 samples. The first treatment was done below beta-transus temperature (T-beta) at 920 degrees C/15 min and the second one above beta-transus temperature (T-beta) at 1020 degrees C/15 min followed by water quenching. Both groups of samples were aged at 600 degrees C for 4 h before being air-cooled. The treated samples at 920 degrees C showed an equiaxed alpha + beta structure. However, a complete martensitic structure was obtained in the treated samples at 1020 degrees C. In addition, secondary alpha-platelets (alpha(s)) precipitated inside retained beta-phase (beta(r)) due to aging process. The treated samples at 920 degrees C revealed the best tensile properties (tensile strength, 1447 MPa, and elongation, 8%). Theoretical study using Solidworks simulation program showed a fatigue limit of 709 MPa for as-received smooth samples. The treated samples at 920 degrees C obtained the highest fatigue limit of 866.5 MPa. However, the treated samples at 1020 degrees C revealed the lowest fatigue limit of 598.5 MPa. The as-received notched samples recorded a fatigue limit of 392 MPa by a decrease in the fatigue limit of about 45% compared with the as-received smooth samples. The experimental study using rotary bending fatigue machine recorded the best fatigue limit of 782.5 MPa for treated samples at 920 degrees C. As-received and treated samples at 1020 degrees C achieved fatigue limits of 651 and 546 MPa, respectively. The as-received notched samples showed a reduction in fatigue limit by approximately 43% from 625 to 359 MPa. Hence, the treated samples at 920 degrees C showed the best fatigue properties. The difference between theoretical and experimental fatigue values was less than 10% in four studied conditions.
引用
收藏
页码：443 / 453
页数：11
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