Coarsening of carbides during different heat treatment conditions

Miao, Kai; He, Yanlin; Zhu, Naqiong; Wang, Jingjing; Lu, Xiao-Gang; Li, Lin

doi:10.1016/j.jallcom.2014.10.115

Cited by 26 publications

(7 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The carbides coarsen after long time tempering, but their coarsening rates are different. In general, the coarsening rates of Cr‐rich carbides, like M 23 C 6 and M 7 C 3 , are larger than those of V‐rich or Nb‐rich carbides . Moreover, the coarsening rates of MC carbides are varied with the change of M element, which is in the order of NbC < VC < (Mo,V)C .…”

Section: Discussionmentioning

confidence: 98%

“…In general, the coarsening rates of Cr-rich carbides, like M 23 C 6 and M 7 C 3 , are larger than those of V-rich or Nb-rich carbides. [29][30][31] Moreover, the coarsening rates of MC carbides are varied with the change of M element, which is in the order of NbC < VC < (Mo,V)C. [24] In this study, the large-size and the small-size precipitates were studied separately due to the large size difference of these precipitates. Steels A and C were chosen to study the coarsening behaviors of the precipitates due to the difference of their tempering stabilities.…”

Section: Effect Of Tempering Time On the Carbide Coarsening And Mechamentioning

confidence: 99%

See 1 more Smart Citation

Effects of Nb and Tempering Time on Carbide Precipitation Behavior and Mechanical Properties of Cr–Mo–V Steel for Brake Discs

Wang

Cheng

et al. 2018

steel research int.

View full text Add to dashboard Cite

To improve the performance of the steel for brake discs, like mechanical properties and thermal fatigue resistance, Nb is added to the steel. In this paper, the effects of Nb and tempering time on the microstructure and mechanical properties of the steel have been studied. The investigation of precipitation behaviors is based on Thermo‐Calc software and transmission electron microscopy. The results show there is a negative linear relationship between the yield strength and the logarithm of time, and tempering time should not exceed 2 h. V‐rich M8C7 and NbC occur during austenitizing, while (Mo,V)C, M23C6, and M7C3 precipitate during tempering. (Mo,V)C has a strong strengthening effect at the early stage of tempering, but it grows faster than M8C7. With 0.025% Nb addition, the yield strength and impact energy increase simultaneously due to the refinement of martensite; the addition of 0.045% Nb promotes the tempering stability due to the suppression of precipitation and coarsening of Cr carbides and the precipitation strengthening of M8C7 and NbC, therefore, the addition of 0.025–0.045% Nb is conducive to improving the performance of the steel. Moreover, the suppression of Cr carbides with 0.045% Nb addition makes up for the damage of large NbC to toughness.

show abstract

Section: Discussionmentioning

confidence: 98%

Section: Effect Of Tempering Time On the Carbide Coarsening And Mechamentioning

confidence: 99%

Effects of Nb and Tempering Time on Carbide Precipitation Behavior and Mechanical Properties of Cr–Mo–V Steel for Brake Discs

Wang

Cheng

et al. 2018

steel research int.

View full text Add to dashboard Cite

show abstract

“…D2 geleneksel çeliğinin sahip olduğu ana karbür yapılarının iri taneli ve daha az homojen dağılım gösterdiği gözlemlenirken, yeni nesil SİTÇ olan C2 ve K2 çeliklerinde karbür yapılarının daha ince olduğu ve homojen bir şekilde dağıldığı görülmektedir. Karbür yapılarının daha ince ve homojen dağılım göstermesi aşınma direnci ve mekanik özelliklerde olumlu yönde etki ettiği farklı çalışmalarda tespit edilmiştir [13,14]. İnce ve eş aralıklarla dağılmış karbür yapıları tokluk direncini de artırmaktadır [15].…”

Section: şEkil 2 Sac Metal Kesme Kalıbına Ait Temel Parçalar [11] 3 B...unclassified

Kalıpçılıkta kullanılan soğuk iş takım çeliklerinin karşılaştırmalı performans analizi

ÜNAL

Tünçay

Şeşen

et al. 2023

NÖHÜ Müh. Bilim. Derg.

View full text Add to dashboard Cite

Çelik, metaller içerisinde en yaygın kullanılanlardan biridir. Birçok farklı türü olan çeliklerden soğuk iş takım çelikleri (SİTÇ) özellikle kalıp sanayisinde sıklıkla tercih edilmektedir. Son zamanlarda geleneksel SİTÇ’ne ek olarak yeni nesil SİTÇ de kullanıma sunulmuştur. Bu çalışma, geleneksel ve iki adet yeni nesil SİTÇ’nin zımba malzemesi olarak elektrik motorunda kullanılan rotor laminasyon silisli saçlarının şekillendirilmesinde kullanımı incelenmiştir. Yeni nesil SİTÇ’nin geleneksele göre daha uzun ömürlü bir kullanım imkanı sunduğu tespit edilmiştir. İlgili çeliklerin mikroyapıları taramalı elektron mikroskopu (SEM) ve enerji dağılımlı X-ışını spektroskopisi (EDS) yardımıyla incelenmiştir ve oluşturabilecekleri karbür yapıları da FactSage 8.2 termodinamik yazılım programı ile değerlendirilmiştir. Elde edilen sonuçlara göre yeni nesil SİTÇ’nde hem ince ve homojen dağılımlı hem de çoklu karbür yapılarının oluştuğu görülmüştür. Niobyum ve Molibden açısından da zengin karbür yapıları ile birlikte homojen yapılı ince karbür yapılarının yeni nesil SİTÇ’nin sahip olduğu uzun kullanım ömrünün nedeni olduğu düşünülmektedir.

show abstract

“…Lifshitz and Slyozov [44] and Wagner [45] (LSW) derived the first analytical description of particle coarsening in binary alloy systems, in which the predicted coarsening rate of the mean particle size is reported to be proportional to time 1/3 . In recent decades, the theory proposed by LSW has been extended to multicomponent alloys such as Ni superalloys [46][47][48][49][50][51][52], Ti alloys [53][54][55] and other types of alloys [56][57][58]. However, application of LSW theory to MCrAlY alloys does not appear to have been previously reported.…”

Section: Introductionmentioning

confidence: 99%

An analytical approach to the β-phase coarsening behaviour in a thermally sprayed CoNiCrAlY bond coat alloy

Chen

McCartney

2017

Journal of Alloys and Compounds

View full text Add to dashboard Cite

This paper investigates the β-phase coarsening behaviour during isothermal heat treatment of free-standing CoNiCrAlY (Co-31.7%Ni-20.8%Cr-8.1%Al-0.5%Y, all in wt%) coatings prepared by high velocity oxy-fuel (HVOF) thermal spraying. The microstructure of the coatings was characterised using scanning electron microscopy with energy dispersive X-ray (EDX) analysis and electron backscatter diffraction (EBSD). It comprises a two phase structure of fcc γ-Ni matrix and bcc β-NiAl precipitates. The volume fraction of the γ-Ni and the β-NiAl phases were measured to be around 70% and 30% respectively, with grain sizes varying largely from 0.5 to 2 µm for both phases. Isothermal heat treatments of the freestanding coatings were carried out at 1100 C for times up to 250 h. The β-phase coarsening behaviour during isothermal heat treatments was analysed by quantitative metallography. It is shown that the coarsening behaviour of β phase in the CoNiCrAlY alloy followed the classical Lifshitz-Slyozov-Wagner (LSW) theory of Ostwald ripening. By incorporating a dimensionless factor which correlates with volume fraction of the β phase, a modified LSW model coupled with formulaic interfacial energy and effective diffusion coefficient of the 2 CoNiCrAlY alloy was utilised to interpret the coarsening behaviour of the β phase. The coarsening rate coefficient obtained from the modified LSW model shows good agreement with the corresponding experimental result.

show abstract

Coarsening of carbides during different heat treatment conditions

Cited by 26 publications

References 20 publications

Effects of Nb and Tempering Time on Carbide Precipitation Behavior and Mechanical Properties of Cr–Mo–V Steel for Brake Discs

Effects of Nb and Tempering Time on Carbide Precipitation Behavior and Mechanical Properties of Cr–Mo–V Steel for Brake Discs

Kalıpçılıkta kullanılan soğuk iş takım çeliklerinin karşılaştırmalı performans analizi

An analytical approach to the β-phase coarsening behaviour in a thermally sprayed CoNiCrAlY bond coat alloy

Contact Info

Product

Resources

About