Effect of Cu₃P addition on sintering behaviour of elemental powders in the composition of 465 stainless steel

Abstract

The addition of Cu 3 P for developing the high strength 465 maraging stainless steel from elemental powders was studied. The sintering parameters investigated were sintering temperature, sintering time and wt-%Cu 3 P. In vacuum sintering, effective sintering took place between 1300 and 1350uC. The maximum sintered density of 7 . 44 g cm 23 was achieved at 1350uC for 60 min with 4-6 wt-%Cu 3 P. More than 6 wt-%Cu 3 P content and temperature .1350uC caused slumping of the specimens. The sintered specimens were heat treated and a maximum ultimate tensile strength (UTS) of 767 MPa was achieved with 4 wt-%Cu 3 P content. The maximum hardness of 45 . 5 HRC was achieved in heat treated condition with 4 wt-%Cu 3 P content. Above 4 wt-%Cu 3 P content increase in density was observed whereas the response to heat treatment decreased. Fracture morphologies of the sintered specimens were also reported. A comparison of sintering behaviour and mechanical properties of elemental powders with prealloyed powders was also given in the present study.

WITHDRAWN: Processing, microstructure and mechanical properties of TiC–465 stainless steel/465 stainless steel layer composites

“…The hardness of the substrate material was 40.5-41 HRC after sintering. The hardness values for top layer and substrate material after sintering agree well with the previous findings [12,16,[19][20][21]. The overview of the mechanical properties is given in Table 2.The bending strength of the layered materials is measured in the direction perpendicular to the layer alignment.…”

“…Recently in our study, we reported that the elemental and pre alloyed powders of 465 stainless steel can approach to 7.44 g/cm 3 and 7.57 g/cm 3 density, respectively, when sintered at 1350 • C for 1 h and exhibit good mechanical properties after sintering process [12]. Fig.…”

“…High density is imperative for improved mechanical properties and corrosion resistance in all P/M parts. In our previous study, we reported the densification behavior and mechanical properties of the sintered 465 stainless steels [12].…”

Enhanced sintering, microstructure evolution and mechanical properties of 316L stainless steel with MoSi2 addition

“…In order to compete with dense 316L parts, high density P/M 316L parts with high mechanical and corrosion properties are required. One of the investigated ways to fabricate high density P/M stainless steel parts is the addition of sintering additives to stainless steel powder [2]. The sintering additives lower the sintering temperature and activate densification mechanisms to eliminate pores.…”

“…The sintering additives lower the sintering temperature and activate densification mechanisms to eliminate pores. Sintering additives such as FeB, NiB, FeMoB, Si and Cu 3 P have been reported for the enhanced sintering of stainless steels [2][3][4][5][6][7][8]. These sintering additives activate the sintering process of stainless steel powders by the formation of a liquid phase.…”