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首页> 外文期刊>Materials Science and Engineering >Plane strain fracture behavior of a new high strength Ti-5Al-3Mo-3V-2Zr-2Cr-1Nb-1Fe alloy during heat treatment
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Plane strain fracture behavior of a new high strength Ti-5Al-3Mo-3V-2Zr-2Cr-1Nb-1Fe alloy during heat treatment

机译：热处理过程中新型高强度Ti-5Al-3MO-3V-2ZR-2Cr-1NB-1Fe合金的平面菌株裂缝行为

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摘要

Plane strain fracture behaviors of a newly developed high strength Ti-5Al-3Mo-3V-2Zr-2Cr-1Nb-1Fe (Ti-5321) alloy with two typical microstructures were investigated in this study. The two microstructures were obtained by STA (solution treated & aged) and BASCA (p annealed with subsequent slow cooling & aged) heat treatments, respectively. The plane strain fracture toughness of STA and BASCA specimen were 73.1 MPa m~(1/2) and 57.7 MPa m1/2, respectively. Interaction between crack path and microstructure was investigated by SEM and EBSD to identify the microstructure characteristics that influence the plastic deformation in crack tip plastic zone (CTPZ) and crack propagation. The CTPZ in STA specimen exhibited a lot of uniform voids and microcracks located at α_p/β_t and α_p/α_p interfaces, and the tortuosity of crack path was 0.063 owing to the transgranular and inter-granular propagation. The microcracks in CTPZ of BASCA specimen were focused on the partial α_(GB)/β_t interfaces, and the crack path tortuosity was 0.153 due to the intergranular propagation which are regarded as a low energy crack path. Both of the energy consumption during damage formation in CTPZ and crack growth in BASCA specimen were less than that in STA specimen owing to the presence of the continuous grain boundary a, leading to microcracks nucleation and fracture at grain boundaries. Besides, the crystal orientations of a phase around the crack path were investigated to further reveal the crack propagation mechanism. The results showed that the large misorientation angle (nearly 90°) between a/a phases could promote the crack diversion, and crack tended to be arrested prior to entering a plate with a c-axis nearly in alignment with the loading direction.
机译：本研究研究了新开发的高强度Ti-5Al-3MO-3V-2ZR-2CR-1NB-1FE（TI-5321）合金的平面应变骨折行为，具有两个典型的微观结构。通过STA（溶液处理和老化）和Basca（用随后的缓慢冷却和老化的）热处理获得了两个微结构。 STA和Basca样本的平面应变断裂韧性分别为73.1MPa m〜（1/2）和57.7MPa m1 / 2。通过SEM和EBSD研究了裂纹路径和微观结构之间的相互作用，以识别影响裂纹尖端塑料区（CTPZ）和裂纹繁殖中塑性变形的微观结构特性。 STA样本中的CTPZ显示出大量均匀的空隙和位于α_P/β_T和α_P/α_P接口的微裂纹，由于狭窄的晶粒细胞和粒状繁殖，裂纹路径的曲折度为0.063。基层标本CTPZ中的微裂纹聚焦在部分α_（GB）/β_T界面上，并且由于被认为是低能量裂纹路径的晶间繁殖，裂纹路径曲折为0.153。由于连续晶界A的存在，CTPZ和Basca样本中损伤形成期间的能量消耗在CTPZ和Basca标本中的裂纹生长期间的能量消耗较小，导致晶界核心成核和骨折。此外，研究了裂纹路径周围的相阶段的晶体取向，进一步揭示了裂缝繁殖机制。结果表明，A /阶段之间的大量误导角（接近90°）可以促进裂缝转移，并且在进入具有C轴的板材之前，裂缝倾向于被捕，几乎与装载方向对齐。

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