Effect of post-treatments on microstructure and mechanical properties of a novel nickel-based powder metallurgy superalloy processed by selective laser melting

Hao, Zhibo1; Tian, Tian1; Yang, Yan1; Peng, Shiqing1; Li, Xinggang2,3; Ge, Changchun1; Gan, Bin4; Zhu, Qiang3

2019-10

10.1088/2053-1591/ab4108

Materials Research Express   影响因子和分区

2053-1591

A newly developed third generation nickel-based powder metallurgy (PM) superalloy, designated as FGH100L, was produced through Selective Laser Melting (SLM). Post-treatments, including Heat Treatment (HT), Hot Isostatic Pressing (HIP) and combined HIP + HT treatment, were carried out on the as-SLMed alloy to improve its mechanical properties by controlling the microstructure and/or reducing the defects in the alloy. Both HT and HIP treatments facilitated the recovery and recrystallization of the superalloy, especially when the solution temperature reached 1150 degrees C, thereby homogenizing the microstructure and refining the grains. During the post-treatment, the number density of-gamma' precipitates increased obviously with the process varying from SLM, SLM + HIP, SLM + HT to SLM + HIP + HT, and both yield strength and ultimate strength increased accordingly, indicating that the precipitation strengthening played a major role in improving the alloy strength. During the HIP process, the size and quantity of the pores were greatly reduced, which contributed greatly to a much higher elongation of the SLM + HIP alloy than that of the SLM and SLM + HT alloys. The fracture surfaces of the SLM alloys after different post-treatments showed transgranular fracture features, while the intergranular fracture was the main fracture mode of the as SLM alloy.

selective laser melting nickel-based superalloy hot isostatic pressing heat treatment microstructure tensile

SCI ; EI

英语

通讯

Shenzhen Science and Technology Innovation Commission[JSGG20180508152608855] ; Shenzhen Science and Technology Innovation Commission[JCYJ20170817110358927]

Materials Science

Materials Science, Multidisciplinary

WOS:000487708400003

IOP PUBLISHING LTD

20194007490161

Fracture ; Heat treatment ; Hot isostatic pressing ; Melting ; Microstructure ; Nickel ; Nickel alloys ; Precipitation (chemical) ; Selective laser melting ; Sintering ; Superalloys ; Tensile strength ; Textures

Metallurgy and Metallography:531 ; Heat Treatment Processes:537.1 ; Nickel:548.1 ; Nickel Alloys:548.2 ; Chemical Operations:802.3 ; Materials Science:951

Web of Science

1.USTB, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
2.Southern Univ Sci & Technol SUSTech, Acad Adv Interdisciplinary Studies, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol SUSTech, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China
4.Cent Iron & Steel Res Inst, Beijing Key Lab Adv High Temp Mat, Beijing 100081, Peoples R China

Hao, Zhibo,Tian, Tian,Yang, Yan,et al. Effect of post-treatments on microstructure and mechanical properties of a novel nickel-based powder metallurgy superalloy processed by selective laser melting[J]. Materials Research Express,2019,6(10).

Hao, Zhibo.,Tian, Tian.,Yang, Yan.,Peng, Shiqing.,Li, Xinggang.,...&Zhu, Qiang.(2019).Effect of post-treatments on microstructure and mechanical properties of a novel nickel-based powder metallurgy superalloy processed by selective laser melting.Materials Research Express,6(10).

Hao, Zhibo,et al."Effect of post-treatments on microstructure and mechanical properties of a novel nickel-based powder metallurgy superalloy processed by selective laser melting".Materials Research Express 6.10(2019).