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Effect of LAB on the Stress Rupture Properties and Fracture Characteristic of DD6 Single Crystal Superalloy
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Effect of LAB on the Stress Rupture Properties and Fracture Characteristic of DD6 Single Crystal Superalloy
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    摘要:

    用雙籽晶法制備了帶有扭轉(zhuǎn)小角度晶界的DD6單晶高溫合金雙晶試板。在760 oC/758 MPa, 850 oC/550 MPa 和 980 oC/250 MPa條件下研究了小角度晶界對合金持久性能和斷裂特征的影響，用掃描電鏡分析了斷口形貌和斷裂機制。結(jié)果表明，晶界角度相對較小時，對合金的持久性能影響較小。在同一測試條件下，合金的持久性能隨著晶界角度增大而減小。在同一測試條件下隨著晶界角度增大，或者在相同晶界角度隨著測試溫度升高應(yīng)力減小，持久斷裂有逐漸出現(xiàn)沿晶斷裂的趨勢

    Abstract:

    The slabs of the second generation single crystal superalloy DD6 were cast using bi-seeded crystals with symmetric twist low angle grain boundaries. The influence of low angle boundary (LAB) on the stress rupture properties of the alloy was investigated at 760 oC/758 MPa, 850 oC/550 MPa and 980 oC/250 MPa. SEM was used to study the fracture surface and the failure mechanism. The results show that when the misorientation angle of LAB is relatively small it has a less effect on the stress rupture properties of the alloy. The stress rupture properties decrease with the misorientation increase on the same test conditions. The fracture characteristic of specimen shows intergranular rupture trend with the misorientation increases on the same conditions or with increasing of temperature and decreasing of stress for the same misorientation of LAB

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史振學(xué),李嘉榮,劉世忠,趙金乾. Effect of LAB on the Stress Rupture Properties and Fracture Characteristic of DD6 Single Crystal Superalloy[J].稀有金屬材料與工程,2012,41(6):962~966.[Shi Zhenxue, Li Jiarong, Liu Shizhong, Zhao Jinqian. Effect of LAB on the Stress Rupture Properties and Fracture Characteristic of DD6 Single Crystal Superalloy[J]. Rare Metal Materials and Engineering,2012,41(6):962~966.]
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  • 收稿日期:2011-07-15
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