Influence of Hot Isostatic Pressing Temperature on the Microstructure and Properties of AlSi7Cu2Mg Alloys
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2020年第6期
论文作者：管兰芳 WEI Zhenhua MAO Hongkui 段瑞斌 张文达 HOU Jianbin LIU Hongbin XU Hong
摘 要：The roles of hot isostatic pressing （HIP） temperatures （490 ℃/100 MPa/2 h,510 ℃/100 MPa/2 h,530 ℃/100 MPa/2 h） in the microstructure and properties of AlSi7Cu2Mg alloy step castings with three types wall thicknesses were studied.The experimental results show that HIP at 490 ℃ could effectively eliminate the internal closed porosity of the castings with a wall thickness of ≤40 mm,but for heavy castings （70 mm）,even HIP at 530 ℃,a few loose defects remained inside the castings.Two types of incipient eutectics containing Al5Mg8Si6Cu2 and Al2Cu were observed in the samples that HIP at 530 ℃,which was responsible for the decrease of the tensile strength of the castings within the medium wall thickness （40 mm） compared with that HIP at 490 ℃.HIP could greatly reduce the difference of the tensile strength values of castings with wall thicknesses 17 mm and 70 mm from 117.93 MPa （without HIP） to 25.7 MPa （with HIP at 530 ℃）.
管兰芳1,2，WEI Zhenhua1,2，MAO Hongkui1,2，段瑞斌1,2，张文达1,2，HOU Jianbin3，LIU Hongbin3，XU Hong1,2
1. School of Materials Science and Engineering, North University of China2. Shanxi Key Laboratory of Controlled Metal Solidification and Precision Manufacturing3. Shanxi Diesel Engine Industry Co.,Ltd.
摘 要：The roles of hot isostatic pressing （HIP） temperatures （490 ℃/100 MPa/2 h,510 ℃/100 MPa/2 h,530 ℃/100 MPa/2 h） in the microstructure and properties of AlSi7Cu2Mg alloy step castings with three types wall thicknesses were studied.The experimental results show that HIP at 490 ℃ could effectively eliminate the internal closed porosity of the castings with a wall thickness of ≤40 mm,but for heavy castings （70 mm）,even HIP at 530 ℃,a few loose defects remained inside the castings.Two types of incipient eutectics containing Al5Mg8Si6Cu2 and Al2Cu were observed in the samples that HIP at 530 ℃,which was responsible for the decrease of the tensile strength of the castings within the medium wall thickness （40 mm） compared with that HIP at 490 ℃.HIP could greatly reduce the difference of the tensile strength values of castings with wall thicknesses 17 mm and 70 mm from 117.93 MPa （without HIP） to 25.7 MPa （with HIP at 530 ℃）.
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