Development of Stellite alloy composites with sintering/HIPing technique for wear-resistant applications

Opriș, Carmen; Liu, R.; Yao, Matthew; Wu, Xijia

doi:10.1016/j.matdes.2005.08.004

Cited by 51 publications

(36 citation statements)

References 15 publications

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“…Where the F was maximum fracture load, L was 30 mm, k was chamfer correction factor (normally 1.001.02), b and h were 5 mm in the equation R bm = 3FLk/2bh 2 , respectively. The specimen dimensions of the TRS test were 5 © 5 © 40 mm 3 . Porosity test was conducted in accordance to the ASTM C373-88 standard.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Cobalt-Based Alloys Strengthened with Tantalum Carbide Powder <i>via</i> Vacuum Sintering and HIP Treatments

Chang

Chen

2014

Mater. Trans.

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In this study, different amounts of TaC powders (0, 10, 15 and 20 mass%) were mixed and added to the cobalt-based alloy powders. The composite powders were sintered at 1260, 1270, 1280 and 1290°C, respectively, for 1 h. The experimental results showed that adding 10 mass% TaC and sintering at 1270°C for 1 h was the optimal process, resulting a high TRS value of 1160 MPa and uniform carbides precipitations. From the microstructural observations, it was cleared that M 6 C carbides precipitated in the matrix of the Co-based alloys (0% TaC) after vacuum sintering. However, the more uniform precipitations of M 6 C, M 23 C 6 and MC (M = Ta) carbides precipitated in the matrix and grain boundaries of the Co-based alloys after vacuum sintering. Furthermore, in the HIP treatment (1250°C/125 MPa/100 min) of 0% and 10% TaC sintered composite materials, it was proved that the closed pores were effectively eliminated and mechanical properties significantly improved. The highest hardness (HRA 79.3) and TRS (1720 MPa) were obtained by adding 10% TaC powders, which were sintered at 1270°C for 1 h, followed by HIP treatment.

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Section: Methodsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Cobalt-Based Alloys Strengthened with Tantalum Carbide Powder <i>via</i> Vacuum Sintering and HIP Treatments

Chang

Chen

2014

Mater. Trans.

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“…1) Their design is aimed primarily at improving elevated temperature strength by use of solid-solution and carbidestrengthening mechanisms. 2,3) In the cobalt-based alloys, chromium improves oxidation and heat-corrosion resistance; producing strengthening by the formation of M 7 C and M 23 C 6 carbides.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the MC Carbides and Mechanical Properties in a TiC Particles-Strengthened Cobalt-Based Alloy through HIP, Solid-Solution and Aging Treatments

Chang

2013

Mater. Trans.

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In previous studies, we mixed and added different amounts of TiC powders (0, 10, 15 and 20 mass%) to the cobalt-based alloy powders. The results showed that adding 15 mass% TiC powder to the cobalt-based alloy and sintering at 1280°C for 1 h was the optimal process. The aim of this paper is continue exploring a series of HIPing processes and various heat treatments for T0 and T15 composite materials, and examining the effects on the microstructure and mechanical properties of TiC particles-strengthened cobalt-based alloy. The experimental results showed that the highest TRS value of 1566.7 MPa was obtained by the 15 mass% TiC additive powders, which was sintered at 1280°C for 1 h, followed by HIP plus solid-solution heat treatment. The experiment proved that the closed pores can be effectively eliminated (1.34% ¼ 0.69%) by HIP treatment. In addition, the more uniform precipitation of M 6 C carbides appeared in the grain-boundary and matrix after aging treatment. Moreover, the added amounts of TiC powder play an important role in improving the mechanical properties of cobalt-based alloy.

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“…Yüksek mukavemetli, yüksek sıcaklıklarda aşınma ve korozyon direncini koruyabilen malzemelerin tasarımı ve üretimi havacılık, otomotiv, kimya ve petrol endüstrilerindeki şiddetli servis şartları için büyük önem taşımaktadır [1]. Geleneksel olarak süperalaşımlar bu uygulama alanlarında yaygın olarak kullanılmaktadırlar.…”

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“…[24]. Stellite alaşımları üzerine yapılan çok sayıda çalışmada ise tam yoğunluğa ulaşılabilmesi için sıcak izostatik presleme (HIP) yöntemi kullanılmıştır [1,10,22,29,30]. Bazı çalışmalarda HIP ile üretilen malzemelere ikinci bir HIP'leme işlemi uygulanmıştır [22].…”

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“…Bazı çalışmalarda HIP ile üretilen malzemelere ikinci bir HIP'leme işlemi uygulanmıştır [22]. Hatta bazı çalışmalarda HIP uygulamasına rağmen %100 bağıl yoğunluğa ulaşılamamıştır [1]. Gülsoy ve arkadaşları tarafından gerçekleştirilen bir çalışmada [31] önalaşımlı Stellite 6 alaşım tozundan toz enjeksiyon kalıplama yöntemi ile şekillendirilen ham parçaların 1200 o C'de sinterlenmesi ile yaklaşık %90 bağıl yoğunluğa ulaşılmıştır.…”

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Toz metalurjisi tekniği ile üretilen kobalt esaslı süperalaşımlarda element ilavelerinin mikroyapı ve mekanik özelliklere etkisi

Özgün¹,

Akbulut²

2017

SAÜ Fen Bilimleri Enstitüsü Dergisi

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ÖZBu çalışmada, toz metalurjisi (T/M) tekniği ile element tozlarından üretilen Stellite 6 süperalaşım malzemelerin mikroyapı ve mekanik özelliklerine Fe ve B elementlerinin etkisi incelenmiştir. Yüksek saflıktaki element tozlarından farklı oranlarda Fe ve B içeriğine sahip karışım tozlar hazırlanmıştır. Hazırlanan karışımlar T/M yöntemi ile şekillendirilip farklı sıcaklıklarda sinterlenmişlerdir. Sinterleme işlemlerinin başarısı yoğunluk ölçümleri ile değerlendirilmiştir. Mikroyapısal karakterizasyon X-ışınları analizi (XRD), taramalı elektron mikroskobu (SEM) incelemeleri ve enerji dağılımı spektrometresi (EDS) ile gerçekleştirilmiştir. Mekanik özelliklerin karakterizasyonu için mikrosertlik ölçümleri yapılmıştır. Stellite 6 numunelerinin mikroyapısında, kullanılan Cr tozunun iri boyutlu olması nedeniyle iri boyutlu karbürlerin oluştuğu tespit edilmiştir. B ilavesi ile birlikte bağıl yoğunluk değerleri bir miktar artmıştır. B ile birlikte Fe elementinin ilave edilmesiyle bağıl yoğunluk önemli ölçüde artış göstermiştir.Anahtar Kelimeler: Stellite 6, B ilavesi, Fe ilavesi, yoğunluk, mikroyapı, sertlikThe effect of element additions on the microstructure and the mechanical properties of cobalt based superalloys produced via powder metallurgy technique ABSTRACT In this study, the effect of Fe and B elements on the microstructure and mechanical properties of Stellite 6 superalloy materials produced from elemental powders by powder metallurgy (P/M) technique was investigated. Powder mixtures contained different Fe and B content were prepared from high purity elemental powders. The prepared powder mixtures were shaped by P/M method and then sintered at various temperatures. The success of sintering operations was determined by density measurements. Microstructural characterization was carried out with X-ray diffraction analysis (XRD), scanning electron microscope (SEM) and energy dispersive spectrometry (EDS). Microhardness measurements were conducted for to characterize mechanical properties. Due to large particle size of the used Cr powder coarse carbides formed in the microstructure of Stellite 6 samples. Relative density values increased slightly with B addition. Relative density was increased dramatically by the addition of Fe element with B.

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Development of Stellite alloy composites with sintering/HIPing technique for wear-resistant applications

Cited by 51 publications

References 15 publications

Microstructure and Mechanical Properties of Cobalt-Based Alloys Strengthened with Tantalum Carbide Powder <i>via</i> Vacuum Sintering and HIP Treatments

Microstructure and Mechanical Properties of Cobalt-Based Alloys Strengthened with Tantalum Carbide Powder <i>via</i> Vacuum Sintering and HIP Treatments

Characterization of the MC Carbides and Mechanical Properties in a TiC Particles-Strengthened Cobalt-Based Alloy through HIP, Solid-Solution and Aging Treatments

Toz metalurjisi tekniği ile üretilen kobalt esaslı süperalaşımlarda element ilavelerinin mikroyapı ve mekanik özelliklere etkisi

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