Mechanical Properties of M7 High Speed Cast Steel Modified with Niobium.

Kheirandish, Shahram; Kharrazi, Y. H. K.; Mirdamadi, Sh.

doi:10.2355/isijinternational.37.721

Cited by 17 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous investigations have shown that adding the strong carbide/ carbonitride forming elements (such as Ti, Nb, V and Zr) or rare earth metals (such as Ce, La and Y) to HSS is beneficial to the refinement of the coarse eutectic carbides and the improvement of carbides distribution. 1,[9][10][11] However, these elements are either relatively rare or expensive. Nitrogen (N), as an important alloying element, has been widely applied in the stainless steels, and is proved to significantly enhance the mechanical property and corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of High Nitrogen Addition on Microstructure and Mechanical Properties of As-cast M42 High Speed Steel

Jiao

Feng

et al. 2020

ISIJ Int.

View full text Add to dashboard Cite

This study systematically investigated the influence of high nitrogen (N) addition (0.205 wt.%) on microstructure and mechanical properties of as-cast M42 high speed steel. The results demonstrate that the conventional and high-nitrogen M42 cast ingots are mainly composed of martensite, retained austenite and various precipitates (M 2 C, M 6 C as well as MC in M42 cast ingot or M(C, N) in M42N cast ingot). The addition of N could increase the retained austenite content, trigger the transformation of MC to M(C, N), favor the formation of M 2 C at the expense of M 6 C, and improve the distribution uniformity of M 6 C at the macroscopic scale. Moreover, the addition of N could lead to the reduction of the secondary dendrite arm spacing as well as the decrease of the thickness and area fraction of eutectic carbides, and improve the distribution uniformity of eutectic carbides at the microscopic scale. The M(C, N) particles form directly from the liquid phase prior to the formation of primary austenite, which could act as the heterogeneous nuclei of primary austenite and thus promote the refinement of the as-cast microstructure. The addition of N slightly decreases the macro-hardness and ultimate compression strength of the cast ingot but increases its ductility, which could be ascribed to the increase of retained austenite content and the reduction in the amount of eutectic carbides. Therefore, high N addition can significantly improve the as-cast microstructure of M42 high speed steel, which is promising for the further enhancement of the mechanical property and service life of the final product.KEY WORDS: M42 high speed steel; pressurized metallurgy; nitrogen; as-cast microstructure; precipitates; mechanical property. N i J J J J J D

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of High Nitrogen Addition on Microstructure and Mechanical Properties of As-cast M42 High Speed Steel

Jiao

Feng

et al. 2020

ISIJ Int.

View full text Add to dashboard Cite

show abstract

“…For conventional steel, vanadium carbides seem to be precipitated at the end of solidification just before the formation of eutectic phase 10, hence they have approximately large dispersed single shape and are always formed near the eutectic carbides. On the other hand, single vanadium nitrides were precipitated in nitrogen containing steel, IF‐HN.…”

Section: Resultsmentioning

confidence: 99%

Effect of Nitrogen and Niobium on the Structure and Secondary Hardening of Super Hard High Speed Tool Steel

Halfa

Eissa

El-Fawakhry

et al. 2011

steel research int.

View full text Add to dashboard Cite

High‐speed steels have been used mostly for multi‐point cutting tools and for plastic working tools. High speed steels are ferrous based alloys of the Fe‐C‐X multi‐component system where X represents a group of alloying elements comprising mainly Cr, W or Mo, V, and Co. The properties of these steels can be improved by modifying their chemical composition or the technology of their production. One of the new trends in modifying the tool steels chemical composition consists in the addition of niobium and nitrogen. In this work, the effects of niobium and nitrogen on morphology of carbides and secondary hardening temperature of investigated high speed tool steels were studied. This experimental work shows that, the conventional ingots have many types of carbides of different shapes and sizes precipitate on the boundary together with thick needle like carbides. On the contrary, for nitrogen steel, the nitrogen alloying leads to form dense, fine and well distributed microstructure. While, on the case of niobium alloying, single carbide (MC), and different types of eutectic carbides were precipitated which have a major effect on the secondary hardening temperature.

show abstract

“…Adding V, Ti, Nb, and other elements to high-speed steel can be formed of a large number of bulk carbides to replace part of network eutectic carbides in HSS during solidification, so that the morphology and distribution of carbides can be improved. [8][9] Studies have shown that the adding of Ti in M2 can make the Ledeburite reduced and massive carbides increased in its solidified structure. The adding Ti to M2 in the basic amount of 1 wt% can eliminate network carbide.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties’ Evaluation of W18Cr4V Modified by Fe–Zr–Nb–N–B Nano‐Powder Inoculants

Cui

Gao

Zhao

2016

steel research int.

View full text Add to dashboard Cite

High speed steel (HSS) is widely used in the production of high‐speed cutting tools and roll etc. Fe–Nb–Zr–N–B amorphous nanocrystalline powder inoculants are designed and prepared by melt and ball‐milling. The carbides in inoculants are easy to act as the nucleus of heterogeneous nucleation during the solidification of the HSS melt, which can refine the grain size of as‐cast HSS significantly. At the same time, it can further improve the morphology and distribution of carbides in the HSS matrix. The phase composition of rapid solidified Fe–Nb–Zr–N–B inoculants is analyzed using XRD and TEM. With the addition of Fe–Nb–Zr–N–B inoculant, the grain size of as‐cast HSS refined evidently, the Net thickness and dendritic spacing decrease obviously, simultaneously, the distribution of the carbides in HSS matrix is more homogeneous. That results lead to a significant improvement of the microstructure and mechanical properties of the HSS. The grain size of HSS in quench state decreases obviously after inoculation treatment with Fe–Nb–Zr–N–B. Meanwhile, the hardness and red hardness as well as the abrasion performance are improved obviously.

show abstract

Mechanical Properties of M7 High Speed Cast Steel Modified with Niobium.

Cited by 17 publications

References 0 publications

Effect of High Nitrogen Addition on Microstructure and Mechanical Properties of As-cast M42 High Speed Steel

Effect of High Nitrogen Addition on Microstructure and Mechanical Properties of As-cast M42 High Speed Steel

Effect of Nitrogen and Niobium on the Structure and Secondary Hardening of Super Hard High Speed Tool Steel

Microstructure and Properties’ Evaluation of W18Cr4V Modified by Fe–Zr–Nb–N–B Nano‐Powder Inoculants

Contact Info

Product

Resources

About