Study on the three-dimensional morphology of MnS inclusions in high sulphur steel

Abstract

MnS inclusions in steels usually have many kinds of morphology. It is difficult to accurately obtain the characteristics of inclusions by two-dimensional observation due to the complex morphology of sulphides in steel, especially the type II MnS inclusions. In this study, the three-dimensional morphology of sulphide in high sulphur steel was investigated by using non-aqueous solution electrolytic etching. Inclusions with a circle and ellipse morphology in two-dimension show more complex morphology in three-dimension. The differences in the distribution, size, shape of sulphides between the two-dimensional and three-dimensional state in the high sulphur steel were studied. Compared with the statistical results of inclusions in two-dimension, the diameter and area in three-dimension are larger than those in two-dimension. Moreover, the proportional function between the size of inclusion in two-dimension and that in three-dimension is proposed.

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References

Fujiwara

Kawazoe

Matsui

Cutting mechanism of sulfrized free-machining steel. Key Eng Mater. 2009;407–408:416–419.

Xia

Wang

et al. Simulation of the continuous casting process in a mold of free-cutting steel 38MnVS based on a MiLE method. Int J Miner Metal Mater. 2011;18(5):562–569.

Zhao

Yang

et al. The effect of size and distribution of MnS inclusions on the austenite grain growth in a low cost hot forged steel. Steel Res Int. 2018;89(2):1700270.

Cheng

Chen

et al. Distribution and morphology of MnS inclusions in resulfurized non-quenched and tempered steel with Zr addition. ISIJ Int. 2018;58(7):1307–1315.

Cheng

Tan

et al. Effect of Zr, Al addition on characteristics of MnS and formation of intragranular ferrite in non-quenched and tempered steel. ISIJ Int. 2018;58(5):921–928.

Furuhara

Shinyoshi

Miyamoto

et al. Multiphase crystallography in the nucleation of intragranular ferrite on MnS+ V(C, N) complex precipitate in austenite. ISIJ Int. 2003;43(12):2028–2037.

Sui

Wang

et al. The formation and growth of sulfides in free-cutting stainless steel. Steel Res Int. 2018;89(10):1800179.

Oikawa

Ohtani

Ishida

et al. The control of the morphology of MnS inclusions in steel during solidification. ISIJ Int. 1995;35(4):402–408.

Shen

Morphology study on inclusion modifications using Mg-Ca treatment in resulfurized special steel. Materials. 2019;12(2):197.

10.

Wang

et al. Effects of cooling rate and Al on MnS formation in medium-carbon non-quenched and tempered steels. Int J Miner Metal Mater. 2015;22(6):589–597.

11.

Liu

Chen

Effect of total oxygen content on the machinability of low carbon resulfurized free cutting steel. Steel Res Int. 2012;83(12):1172–1179.

12.

Chen

Rong

Xue

et al. Effects of elemental Sn on the properties and inclusions of the free-cutting steel. Int J Miner Metal Mater. 2015;22(2):141–148.

13.

Shen

Yang

Zhang

et al. Application of tellurium in free-cutting steels. J Iron Steel Res Int. 2018;25(8):787–795.

14.

Guo

Chen

et al. Thermodynamics of complex sulfide inclusion formation in Ca-treated Al-killed structural steel. Metal Mater Trans B. 2016;47(4):2549–2557.

15.

Doostmohammadi

Karasev

Jönsson

PG.

A comparison of a two-dimensional and a three-dimensional method for inclusion determinations in tool steel. Steel Res Int. 2010;81(5):398–406.

16.

Zhang

Shen

Xie

et al. A method for observing tridimensional morphology of sulfide inclusions by non-aqueous solution electrolytic etching. J Iron Steel Res Int. 2019;26(3):275–284.

17.

Yang

Ying

Zhang

et al. Formation mechanism of complex oxide inclusions in 55SiCr spring steels. Steel Res Int. 2017;89(2):1700277.

18.

Ohta

Suito

Characteristics of particle size distribution of deoxidation products with Mg, Zr, Al, Ca, Si/Mn and Mg/Al in Fe–10mass% Ni alloy. ISIJ Int. 2006;46(1):14–21.