Paper Title:
Investigation of Mechanical Properties of Powder Metallurgy Parts with Control of Microstructure
  Abstract

In the present work, two kinds of steel powder were (Distaloy HP-1 & Ultrapac-LA) selected and subjected to powder metallurgy processing. For Ultrapac-LA, a heterogeneous microstructure consisting of tempered martensite, nickel-rich ferrite, divorced pearlite and nickelrich regions surrounding pores was observed. For Distaloy HP-1 in slow cooling rates (0.4 °C.s-1), the amounts of martensite and bainite varied between 50-60% and 30-40%. However, for fast cooling rates (1.2 °C.s-1), the variation was between 70-80% and 10-20%. The mechanical properties of the prepared samples were studied with controlled production conditions such as cooling rate and heat treatment. The increasing porosity was found to play an important role in the tensile stress and fatigue strength. The ultimate tensile strength and fatigue strength were more than 1000 MPa and 400 MPa in this research (for Distaloy HP-1, 7.2 g.cm-3, 0.5% carbon content and fast cooling rates). Macroscopic examination of the fracture surfaces for all specimens revealed that fatigue crack growth and final fracture regions were brittle and without noticeable permanent deformation. The final fracture regions for all tests were very similar, and the final fracture in these two material conditions revealed brittle macrobehavior and ductile microbehavior.

  Info
Periodical
Materials Science Forum (Volumes 534-536)
Edited by
Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim
Pages
297-300
DOI
10.4028/www.scientific.net/MSF.534-536.297
Citation
H. Khorsand, S.M. Habibi, "Investigation of Mechanical Properties of Powder Metallurgy Parts with Control of Microstructure ", Materials Science Forum, Vols. 534-536, pp. 297-300, 2007
Online since
January 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Zhen Tao Yu, Lian Zhou, Lijuan Luo, Maohong Fan, Yanyan Fu
Abstract:The effects of alloying elements such as Mo, Sn, Zr, Nb, deforming-rate, solid solution and aging treatment on mechanical property and...
595
Authors: Young Seok Song, M.R. Lee, Jeong Tae Kim
Abstract:Alloy 718 ingot with a diameter of 400mm was made by the vacuum melting process ; VIM followed by VAR. Compression tests were conducted on...
3124
Authors: Szilvia Eosoly, Stefan Lohfeld, Dermot Brabazon
Abstract:Selective laser sintering (SLS) has the potential to fabricate bioresorbable polymer / ceramic composite scaffolds with pre-designed external...
659
Authors: Qiang Shen, Chang Lian Chen, Fei Chen, Qi Wen Liu, Lian Meng Zhang
Abstract:Porous calcia stabilized zirconia ceramics (CSZC) with closed pores were presurelessly sintered by adding different contents of zirconia...
435
Authors: Sourav Das, Saurabh Kundu, Arunansu Haldar
Chapter 6: Materials
Abstract:Bainitic steels, which are transformed at very low temperatures, offer an excellent combination of strength and ductility where the strength...
939