Approaches to Reach Fully Dense Powder Metallurgical Materials
High-performance applications of powder metallurgy(PM)steel components are limited by the presence of porosity which contributes to the inferior properties as compared to the wrought material.PM steels,in order to meet the performance demand,require a fully dense material for improved properties.In this study,enhanced densification is achieved through several process routes,such as(1)liquid phase sintering with master alloy,(2)double pressing-double sintering,(3)cold isostatic pressing followed by high-temperature sintering,and(4)high velocity compaction.All these approaches ensure surface pore closure by reaching density levels > 95%after sintering and capsule free hot isostatic pressing is performed to reach full densification.The proposed routes give the flexibility in terms of positioning the PM parts in terms of size and volume.The above processing methods are based on the utilisation of the low alloyed powder which brings cost competitiveness in addition to the capsule free hot isostatic pressing for reaching fully dense PM steels.
Full density PM steel double pressing cold isostatic pressing liquid phase sintering capsule free hot isostatic pressing
Vattur Sundaram Maheswaran Hryha Eduard Nyborg Lars
Department of Industrial and Materials Science,Chalmers University of Technology,SE-412 96 Gothenburg,Sweden
国际会议
北京
英文
1956-1961
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）