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偏離度對抗熱腐蝕單晶高溫合金DD483拉伸性能的影響
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更新時間：2015-11-06
用螺旋選晶器法制備DD483抗熱腐蝕單晶高溫合金，在偏離度小于10°時測試合金從室溫到1 000 ℃的瞬時拉伸性能；研究0~30°范圍內(nèi)偏離度對合金室溫和950 ℃拉伸性能的影響。
偏離度對抗熱腐蝕單晶高溫合金DD483拉伸性能的影響Effects of disorientation on tensile properties of?hot corrosion resistant single crystal superalloy DD483
用螺旋選晶器法制備DD483抗熱腐蝕單晶高溫合金，在偏離度小于10°時測試合金從室溫到1 000 ℃的瞬時拉伸性能；研究0~30°范圍內(nèi)偏離度對合金室溫和950 ℃拉伸性能的影響。結(jié)果表明：由于單相γ′的反常屈服行為，750 ℃時合金的抗拉強度達(dá)到峰值1 300 MPa，屈服強度達(dá)到1 105 MPa；偏離度在0~30°范圍內(nèi)，DD483合金室溫及950℃時的屈服強度和抗拉強度均隨偏離度增加而減小，塑性隨偏離度的增加而增大；不同偏離度樣品的室溫拉伸的變形機制并沒有明顯差別，拉伸性能的差異主要在于Schmid因子和彈性模量的不同；950 ℃時由于開動滑移系數(shù)目的增加，偏離度對合金拉伸強度的影響相對室溫的影響減小。
A hot corrosion resistant single crystal superalloy DD483 made by helix selector method was tested in tension from room temperature (RT) to 1 000 ℃ with disorientation less than 10° and the effects of disorientation within 0?30° on tensile properties at RT and 950 ℃ were researched, respectively. The results show that for the reason of abnormal yield behavior of γ′ single phase, the yield strength and ultimate tensile strength reach the peak values at 750 ℃, after which the yield strength and ultimate tensile strength drop sharply with the increase of temperature; within the disorientation of 0?30°, the yield strength and ultimate tensile strength of DD483 alloy decrease and the plasticity increases at both RT and 950 ℃ with the increase of disorientation; the difference of tensile properties at RT is mainly caused by different Schmid factors in the corresponding direction; the effect of disorientation on tensile properties at 950 ℃ is not as obvious as that at RT for activation of additional slip systems.
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