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Effect of microstructure and chemical composition on

The effects of the microstructural constituents, chemical composition, and retained austenite on high-strength weld metal were studied using preheat-free steels and GMAW solid wires with a low hydrogen content. The cold cracking susceptibility of these GMAW wires was evaluated using the y-groove Tekken test. The results showed that acicular ferrite produced the greatest resistance to cold (PDF) Coupling Effect of Prior Austenite Grain Size and Feb 12, 2020 · The coupling effect of prior austenite grain size and inclusion characteristics on acicular ferrite (AF) formation was investigated in Ti-Zr deoxidized low

(PDF) Effect of Cerium Content on the Evolution of

Jun 29, 2020 · With increase of the inclusion size, the acicular ferrite nucleating rate increased. The probability of inducing nucleation increased gradually with the inclusion size increasing. (PDF) Effect of acicular ferrite formation on grain Acicular ferrite, however, didn't show obvious change. 3.2.Three-dimensional morphology and size of acicular ferriteTypical reconstructed three-dimensional images of acicular ferrite grains in the specimen tempered at 650°C for 2 h are illustrated in Fig. 4. (PDF) Effects of TiMg Complex Inclusions on Acicular The effects of Mg content, inclusion size and austenite grain size on the acicular ferrite nucleation in Mg treated Ti-containing C-Mn steel were studied by high temperature experiment and

Effect of Deoxidizer on Microstructure and Mechanical

Jun 23, 2021 · When the size of inclusions predominantly (Mn, Al, Si) complex oxides was larger than 0.4 m, it was effective on acicular ferrite nucleation and the effectiveness increased as the inclusion size increased . It was also concluded that inclusion size concentrated at 0.30.8 m could more effectively promote the formation of acicular ferrite with excess AlMg alloy and magnesium powder. Effect of Inclusion Size on the Nucleation of Acicular May 31, 2007 · Full Text PDF [698K] Abstracts. References (36) Cited-By (64) Low-carbon steel weld with a high density of oxide inclusions prepared using a experimental metal-cored wire has been examined to study the effect of inclusion size on the formation of acicular ferrite, and to understand the role of inclusion in the nucleation of ferrite lath. Depending on the ferrite morphology associated Effect of Mg addition on formation of intragranular Apr 20, 2018 · The probability of inclusions for nucleating acicular ferrite lath at a given size range is defined as the ratio of the number of inclusions worked as the nucleant of IAF to the number of total inclusions at the same given size range [11, 25]. Figure 6 documents the calculated results as a function of inclusion size. It is found that an increased inclusion size markedly enhances the probability of

Effects of TiAl Complex Deoxidization Inclusions on

The influences of TiAl complex deoxidation inclusions on nucleation of intragranular acicular ferrite (IAF) in CMn steel have been investigated based on four specimens with different Ti and Al contents. The inclusions of Steel 1 and Steel 2 both containing high Al are detected as Al2O3 and Ti3O5 · Al2O3, respectively. Owing to the low concentration of Mn in these inclusions, the Effects of chemistry, density and size distribution of Jan 30, 1992 · Materials Science and Engineering, A 149 (1992) 203-216 2113 Effects of chemistry, density and size distribution of inclusions on the nucleation of acicular ferrite of C-Mn steel shielded-metal-arc-welding weldments Sylvain St-Laurent and Gilles L'Esp6rance Metallurgical Engineering Department, Ecole Polytechnique de MontrOal, PO Box 6079, Station "A ", MontrOal, Quebec H3C Influence of Al deoxidation on the formation of acicular 1 Introduction. Microstructure refinement is the only way to strengthen steel with no reduction in toughness [1,2,3].Acicular ferrite, formed within an austenite grain on an inclusion, can refine the microstructure dramatically [4,5].Thanks to its fine chaotic interlocking nature [6,7,8], which can obstruct the propagation of cracks [1,9,10], AF can enhance the performance of steel.


Acicular ferrite is nucleated intragranularly on the non-metallic inclusions unlike the This favours the AF initiation process in comparison with the effect connected with upper B formation. The consequence of this process is a decrease in the number of B epitaxial nucleation on the inclusion having a good lattice registry (coherency) Quantitative Evaluation of Nucleation Potency of Ti acicular ferrite (AF) plates, and the nucleation ability is affected by many factors due to the competition with other The effect of inclusion size on the nucleation potency of inclusions is well established. According to the heteroge-neous nucleation mechanism, the energy barrier for ferrite SOME ASPECTS OF NON-METALLIC INCLUSIONS ON THE inclusion size [m]. Figure 1:Effect of heat input applied during SAW on inclusion size distribution. (a) 1kJ/mm. (b) 3kJ/mm. Figure 2:(a) Typical EDS analysis of inclusions; (b) Row of inclusions probably segregated on delta ferrite boundary during solidification of low-carbon steel weld metal.

Transformation of M/A Constituents during Tempering and

Jul 17, 2019 · So, the overlapping acicular ferrite microstructure is obtained in the weld metal after direct cooling from the reheating temperature. During tempering, the overlapping acicular ferrite microstructure is degenerated, and martensite/austenite (M/A) constituents in the acicular ferrite microstructure decompose into ferrites and carbides.Effect of Inclusion Size and Type on the Nucleation of With increase of the inclusion size, the acicular ferrite nucleating rate increased. The probability of inducing nucleation increased gradually with the inclusion size increasing. The inclusions had an appropriate size to become nucleation center for acicular ferrite. This optimal size was about 3 m.