利用扫描电子显微镜(scanning electron microscope,SEM)、光学显微镜(optical microscope,OM)、拉伸、蠕变、疲劳试验机等研究了一种新型镍基粉末高温合金FGH4113A(WZ-A3)在2种热处理状态下的显微组织和力学性能,为双性能热处理研究提...利用扫描电子显微镜(scanning electron microscope,SEM)、光学显微镜(optical microscope,OM)、拉伸、蠕变、疲劳试验机等研究了一种新型镍基粉末高温合金FGH4113A(WZ-A3)在2种热处理状态下的显微组织和力学性能,为双性能热处理研究提供组织与力学性能依据。结果表明:FGH4113A合金在双性能热处理中,过固溶与亚固溶态组织与力学性能具有明显的双模特性;室温下,亚固溶态相比过固溶态屈服强度高10.6%,800℃下,过固溶态相比亚固溶态屈服强度高11.7%;与同样是亚固溶或过固溶的其它合金相比,FGH4113A的拉伸强度优于ME3合金,与LSHR合金相当;FGH4113A合金在750℃/450 MPa的蠕变变形以位错滑移机制主导,弥散分布的小尺寸硼化物有助于抗蠕变性能的提高,其抗蠕变性能全面超过ME3合金,与LSHR合金相当;过固溶态的粗晶组织在裂纹扩展中具有更长的滑移带,在循环载荷中具有较低的累积损伤,抗裂纹扩展能力优于亚固溶态;过固溶态的裂纹扩展断口呈现穿晶断裂特征,亚固溶态由于细晶粒边界的一次γ′的存在降低了晶界的抗裂纹扩展能力,断口较粗糙,呈现沿晶-穿晶混合断裂特征。展开更多
对相图的常用实验测定方法进行综述,以Cr-Ni-Ru三元体系相图的高通量测定为例,展示高效测定二元、三元相图的扩散多元节方法。基于相图计算(Calculation of phase diagrams,CALPHAD)方法,以Cr-Ru二元体系和Cr-Ni-Ru三元体系的热力学优...对相图的常用实验测定方法进行综述,以Cr-Ni-Ru三元体系相图的高通量测定为例,展示高效测定二元、三元相图的扩散多元节方法。基于相图计算(Calculation of phase diagrams,CALPHAD)方法,以Cr-Ru二元体系和Cr-Ni-Ru三元体系的热力学优化为例,阐述Cr-Ni-Ru三元体系热力学数据库建立的具体流程,分析当前镍基高温合金研究效率低下的原因。结果表明:快速建立与定量预测材料成分、相、组织、性能关系的高通量实验和计算方法是促进未来镍基高温合金研究发展的重点。展开更多
Residual stress plays an important part in fabricating commercial aero engine Inconel 718 components for their fatigue properties, reliability and durability. Due to the limitation of Chinese neutron diffraction instr...Residual stress plays an important part in fabricating commercial aero engine Inconel 718 components for their fatigue properties, reliability and durability. Due to the limitation of Chinese neutron diffraction instrument and lack of test practice and specifications, there is little systematic research on the residual stress of forged compressor disc. X-ray diffraction and neutron diffraction methods were used to measure the residual stress of Inconel 718 forged discs at the surface and in the interior, respectively. Scanning electron microscope and transmission electron microscope were used to characterize the microstructural features. The residual stress state at the disc is in near-surface compression, balanced by tension within the disc core. However, the surface residual stress of disc depends more on the rough machining than on the forging process. Also, the dislocation densities increase with decreasing distance to the surfaces of disc, and the residual stress accelerates dislocation generation and dynamic recrystallization.展开更多
文摘利用扫描电子显微镜(scanning electron microscope,SEM)、光学显微镜(optical microscope,OM)、拉伸、蠕变、疲劳试验机等研究了一种新型镍基粉末高温合金FGH4113A(WZ-A3)在2种热处理状态下的显微组织和力学性能,为双性能热处理研究提供组织与力学性能依据。结果表明:FGH4113A合金在双性能热处理中,过固溶与亚固溶态组织与力学性能具有明显的双模特性;室温下,亚固溶态相比过固溶态屈服强度高10.6%,800℃下,过固溶态相比亚固溶态屈服强度高11.7%;与同样是亚固溶或过固溶的其它合金相比,FGH4113A的拉伸强度优于ME3合金,与LSHR合金相当;FGH4113A合金在750℃/450 MPa的蠕变变形以位错滑移机制主导,弥散分布的小尺寸硼化物有助于抗蠕变性能的提高,其抗蠕变性能全面超过ME3合金,与LSHR合金相当;过固溶态的粗晶组织在裂纹扩展中具有更长的滑移带,在循环载荷中具有较低的累积损伤,抗裂纹扩展能力优于亚固溶态;过固溶态的裂纹扩展断口呈现穿晶断裂特征,亚固溶态由于细晶粒边界的一次γ′的存在降低了晶界的抗裂纹扩展能力,断口较粗糙,呈现沿晶-穿晶混合断裂特征。
文摘对相图的常用实验测定方法进行综述,以Cr-Ni-Ru三元体系相图的高通量测定为例,展示高效测定二元、三元相图的扩散多元节方法。基于相图计算(Calculation of phase diagrams,CALPHAD)方法,以Cr-Ru二元体系和Cr-Ni-Ru三元体系的热力学优化为例,阐述Cr-Ni-Ru三元体系热力学数据库建立的具体流程,分析当前镍基高温合金研究效率低下的原因。结果表明:快速建立与定量预测材料成分、相、组织、性能关系的高通量实验和计算方法是促进未来镍基高温合金研究发展的重点。
基金Project supported by Commercial Aircraft Engine Co.,Aero Engine Corporation of ChinaProject(2014CB046701) supported by the National Basic Research Program of China
文摘Residual stress plays an important part in fabricating commercial aero engine Inconel 718 components for their fatigue properties, reliability and durability. Due to the limitation of Chinese neutron diffraction instrument and lack of test practice and specifications, there is little systematic research on the residual stress of forged compressor disc. X-ray diffraction and neutron diffraction methods were used to measure the residual stress of Inconel 718 forged discs at the surface and in the interior, respectively. Scanning electron microscope and transmission electron microscope were used to characterize the microstructural features. The residual stress state at the disc is in near-surface compression, balanced by tension within the disc core. However, the surface residual stress of disc depends more on the rough machining than on the forging process. Also, the dislocation densities increase with decreasing distance to the surfaces of disc, and the residual stress accelerates dislocation generation and dynamic recrystallization.
