Influence of Sintering Temperature and Cooling Rate on Microstructure and Mechanical Properties of Pre-alloyed Fe–Cr–Mo Powder Metallurgy Steel

An Fe/FeAl2O4 composite was prepared with Fe-Fe2O3-Al2O3 powder by a hot press sintering method. The mass ratio was 6:1:2, sintering pressure was 30 MPa, and holding time was 120 min. The raw materials for the powder particles were respectively 1 µm (Fe), 0.5 µm (Fe2O3), and 1 µm (Al2O3) in diameter. The effect of sintering temperature on the microstructure and mechanical properties of Fe/FeAl2O4 composite was studied. The results showed that Fe/FeAl2O4 composite was formed by in situ reaction at 1300 °C–1500 °C. With the increased sintering temperature, the microstructure and mechanical properties of the Fe/FeAl2O4 composite showed a change law that initially became better and then became worse. The best microstructure and optimal mechanical properties were obtained at 1400 °C. At this temperature, the grain size of Fe and FeAl2O4 phases in Fe/FeAl2O4 composite was uniform, the relative density was 96.7%, and the Vickers hardness and bending strength were 1.88 GPa and 280.0 MPa, respectively. The wettability between Fe and FeAl2O4 was enhanced with increased sintering temperature. And then the densification process was accelerated. Finally, the microstructure and mechanical properties of the Fe/FeAl2O4 composite were improved.

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Investigating the effects of short time austenitizing and cooling rate on pearlitic microstructure and mechanical properties of a hot rolled plain eutectoid carbon steel

Materials & Design (1980-2015) ◽

10.1016/j.matdes.2014.11.038 ◽

2015 ◽

Vol 67 ◽

pp. 217-223 ◽

Cited By ~ 11

Author(s):

H. Rastegari ◽

A. Kermanpur ◽

A. Najafizadeh

Keyword(s):

Mechanical Properties ◽

Carbon Steel ◽

Cooling Rate ◽

Microstructure And Mechanical Properties ◽

Hot Rolled ◽

Short Time

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Effects of MgO and Y2O3 on the Microstructure and Mechanical Properties of Al2O3 Ceramics

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.589-590.572 ◽

2013 ◽

Vol 589-590 ◽

pp. 572-577 ◽

Cited By ~ 2

Author(s):

Hua He Liu ◽

Han Lian Liu ◽

Chuan Zhen Huang ◽

Bin Zou ◽

Ya Cong Chai

Keyword(s):

Mechanical Properties ◽

Sintering Temperature ◽

Hot Press ◽

Composite Ceramics ◽

Microstructure And Mechanical Properties ◽

Suitable Amount ◽

Hot Press Sintering ◽

Grains Refinement ◽

Better Than

Al2O3-MgO, Al2O3-Y2O3 and Al2O3-MgO-Y2O3 composite ceramics were fabricated respectively by hot-press sintering technique. With the analysis of the mechanical properties and microstructure, it was found that single additive MgO could be more favorable to the grains’ refinement and densification than Y2O3; the composite additive including both MgO and Y2O3 was better than single additive MgO or Y2O3, because their interactions could improve the mechanical properties of the Al2O3 ceramics; The sintering temperature could be reduced by adding the suitable amount of composite additives.

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