【摘 要】
：
研究了热旋锻和退火处理对精密铸造工业纯钛显微组织和力学性能的影响.铸造样品为典型的含有不同形貌的α相组织；而旋锻样品是缠绞的层状组织.在500℃退火处理不会显著改变样
【机 构】
：
Central Metallurgical R&D Institute(CMRDI),Institue of Materials Science and Engineering
论文部分内容阅读
研究了热旋锻和退火处理对精密铸造工业纯钛显微组织和力学性能的影响.铸造样品为典型的含有不同形貌的α相组织；而旋锻样品是缠绞的层状组织.在500℃退火处理不会显著改变样品的显微组织,但在700℃和870℃退火会导致再结晶发生和生成等轴晶组织.铸造棒在近表层生成典型的硬化α层,其最大深度达720μm,最大硬度达HV0.5660.旋锻能使铸造样品的拉伸强度从605MPa增加到895MPa.在500℃退火会导致拉伸强度轻微降低,从895MPa降到865MPa.然而在700℃退火会导致拉伸强度显著下降,从865MPa降到710MPa.当退火温度升高到870℃时,拉伸强度的下降不再明显.铸造和热旋锻样品的断裂应变在0.05～0.12的范围内,而退火后的样品在0.25～0.53的范围.铸态和旋锻态样品表现为脆性解理断裂,而退火态样品为穿晶塑性断裂,伴有韧窝的生成.
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