Microstructure and mechanical property of sintered Fe-Cr-Mo steels due to phase transformations with fast cooling rates

Srijampan, Wananurat; Wiengmoon, Amporn; Morakotjinda, Monnapas; Krataitong, Rungtip; Yotkaew, Thanyaporn; Tosangthum, Nattaya; Tongsri, Ruangdaj

doi:10.1016/j.matdes.2015.09.030

Cited by 23 publications

(9 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reason for these sintered steels having martensite structure is the shifting of the γ–α transformation on the continuous cooling transformations diagram to the right by the influence of C, Ni, and Mo, giving a chance for the material to undergo martensite transformation at slow cooling rates. [ 29,30 ]…”

Section: Resultsmentioning

confidence: 99%

“…The reason for these sintered steels having martensite structure is the shifting of the γ-α transformation on the continuous cooling transformations diagram to the right by the influence of C, Ni, and Mo, giving a chance for the material to undergo martensite transformation at slow cooling rates. [29,30] It can also be seen from Figure 10 that as the sintering temperature increased, the number of interconnected pores decreased, which was accompanied with the shrinkage in the size of the pores. The least porosity occurred in the image of the sample sintered at 1320 °C, which was consistent with the density measurements.…”

Section: Structure Characterizationmentioning

confidence: 89%

See 1 more Smart Citation

Effect of Sintering Temperature on Microstructure and Mechanical Properties of Fe–4Ni–0.8Mo–0.6C Steel Small‐Module Gears Fabricated by Micrometal Injection Molding

Liao

Li³

et al. 2023

steel research int.

View full text Add to dashboard Cite

With the vigorous development of miniaturization, a series of microsystem technologies emerge and play an increasingly paramount role. The demand for microcomponents such as microgears, microreactors, micromedical devices, and microfluidic devices is also increasing rapidly. [1][2][3] These microcomponents exhibit great potential for applications in aeronautics, automotive, consumer electronics, chemical, environmental analysis, and medical technology. [4,5] The development of microsystem technology requires components with sizes or features in the micrometer range. Existing manufacturing processes, such as microlaser ablation and lithographic process, are limited in terms of yield and/or materials. In addition, the traditional machining technology has the problem of low production efficiency and silicon etching has the problem of high cost. [6][7][8] Micro-metal injection molding (micro-MIM), rapidly developed from MIM, is a net or near-net manufacturing technology for preparing 3D complex metal parts, which can meet the requirements of microsystem technology. [9] It completely meets the requirement of high-cost performance and becomes the most potential preparation technology for the mass production of microworkpieces. [10] The major processing steps in micro-MIM technology are similar to MIM, which include the preparation of feedstock by mixing a thermoplastic binder with metal powder, injection molding into the required shape, and debinding to remove the binder system and sintering. [11] However, some injection molding requirements for micro-MIM are different from those used for MIM. To facilitate the manufacture of microstructure, the powder particle size must be fine enough. The specific surface area of fine powder is increased, and the binder with low viscosity but sufficient strength is needed to facilitate the microinjection molding and avoid the damage of green parts during demolding. At the same time, because the microinjection molding cavity is micron, it puts forward higher requirements for the

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Structure Characterizationmentioning

confidence: 89%

Effect of Sintering Temperature on Microstructure and Mechanical Properties of Fe–4Ni–0.8Mo–0.6C Steel Small‐Module Gears Fabricated by Micrometal Injection Molding

Liao

Li³

et al. 2023

steel research int.

View full text Add to dashboard Cite

show abstract

“…To achieve sinter hardening effect, the combined influences of base metal powder compositions and cooling rates of just slightly higher than a cooling rate applied industrially are essential for obtaining hard phases/structures, such as bainite and martensite. [8][9][10][11] In addition to the application of fast cooling rates to manipulate sintered steel microstructures, the concept of hardening sintered steel by using high carbon contents has not been experimentally tried. The graphite, as the typical carbon source for powder metallurgy steel, 12) is employed due to its influences on transformation types and products.…”

Section: Identification Of Carbides and Phase Transformations In Sint...mentioning

confidence: 99%

Identification of Carbides and Phase Transformations in Sintered Fe–Mo–Mn–C Alloys Produced under a Slow Continuous Cooling

et al. 2022

Self Cite

View full text Add to dashboard Cite

Different sintered alloys were produced by sintering and slow cooling of powder compacts made from pre-alloyed Fe-0.50Mo-0.15Mn powder mixed with varied graphite powder contents (0.30-1.20 wt.% with 0.15% increment). According to microstructures, sintered alloys were divided into sintered hypo-eutectoid, near eutectoid, and hyper-eutectoid alloys. By using Groesbeck color tinting and X-ray diffraction technique, the common phase transformation products of these sintered alloys were found to include ferrite and carbides. The sintered hypo-eutectoid alloys had microstructures consisting of polygonal ferrite grains and two forms of ferrite + carbide mixtures, such as ferrite + M 23 C 6 carbide and ferrite + M 3 C carbide. In sintered near-eutectoid alloys, only ferrite + M 3 C carbide mixtures occupied microstructures. In sintered hyper-eutectoid alloys, large proeutectoid M 23 C 6 carbide formed first and followed by abnormal ferrite, degenerate ferrite + M 23 C 6 pearlite, lamellar ferrite + M 23 C 6 pearlite, Widmanstätten M 3 C carbide, inverse bainite (ferrite + M 3 C) and upper bainite (ferrite + M 3 C).

show abstract

“…The overall approach appears to be one of trial and error to select the annealing parameters for producing required martensite/bainite volume fraction. Further, there is no clarity on the soaking times required at the annealing temperature; some authors have used very short soaking periods 29,68,121 whereas others have used very long soaking periods. 38,105,106 Also, very limited literature is reported to study the effect of shape, size, etc.…”

Section: Processing Of Dp Steelsmentioning

confidence: 99%

Third generation of advanced high-strength steels: Processing routes and properties

Nanda

Singh

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

The automobile industry is presently focusing on processing of advanced steels with superior strength-ductility combination and lesser weight as compared to conventional high-strength steels. Advanced high-strength steels are a new class of materials to meet the need of high specific strength while maintaining the high formability required for processing, and that too at reasonably low cost. First and second generation of advanced high-strength steels suffered from some limitations. First generation had high strength but low formability while second generation possessed both strength and ductility but was not cost effective. Amongst the different types of advanced high-strength steels grades, dual-phase steels, transformation-induced plasticity steels, and complex phase steels are considered as very good options for being extended into third generation advanced high-strength steels. The present review presents the various processing routes for these grades developed and discussed by different authors. A novel processing route known as quenching and partitioning route is also discussed. The review also discusses the resulting microstructures and mechanical properties achieved under various processing conditions. Finally, the key findings with regards to further research required for the processing of advanced high-strength steels of third generation have been discussed.

show abstract

Microstructure and mechanical property of sintered Fe-Cr-Mo steels due to phase transformations with fast cooling rates

Cited by 23 publications

References 47 publications

Effect of Sintering Temperature on Microstructure and Mechanical Properties of Fe–4Ni–0.8Mo–0.6C Steel Small‐Module Gears Fabricated by Micrometal Injection Molding

Effect of Sintering Temperature on Microstructure and Mechanical Properties of Fe–4Ni–0.8Mo–0.6C Steel Small‐Module Gears Fabricated by Micrometal Injection Molding

Identification of Carbides and Phase Transformations in Sintered Fe–Mo–Mn–C Alloys Produced under a Slow Continuous Cooling

Third generation of advanced high-strength steels: Processing routes and properties

Contact Info

Product

Resources

About