Study of weldability of a Cr–Si modified heat-resisting alloy

Haro, Sergio; Colás, Rafael; Velasco, Abraham; Lopez, D.

doi:10.1016/s0254-0584(02)00156-6

Cited by 13 publications

(13 citation statements)

References 5 publications

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“…However, processes used up to now do not show sufficient guarantees for the users. Indeed, the welding of heat-resistant cast steels often induces cracking, especially for massive components such as SPF dies [3][4][5][6]. This cracking, generally located in the heat resistant cast steel close to the welded zone, is due to thermal stresses induced by welding, and to subsequent plastic strain which can overstep the elongation to rupture of the material.…”

Section: Introductionmentioning

confidence: 99%

Analysis of weld-cracking and improvement of the weld-repair process of superplastic forming tools

Duchosal

Deschaux-Beaume

Lours

et al. 2013

Materials & Design (1980-2015)

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of weld-cracking and improvement of the weld-repair process of superplastic forming tools. Materials and Design, Elsevier, 2013, 46, pp.731-739. 10.1016/j.matdes.2012 AbstractSuperplastic forming (SPF) dies are generally made of using heat resistant cast steels, which are very sensitive to weld cracking. In order to improve the weld-repair process of such dies to prevent weld-cracking, the microstructure and the mechanical behaviour of a typical heatresistant cast steel was first studied, using isothermal low-cycle fatigue tests and in-situ tensile tests. The welding behaviour of such steel was also investigated, using a shielded metal arc welding (SMAW) process and welding conditions similar to those employed for weld repair industrial dies. The comparison of the aspect of weld-cracking with the fracture mechanisms observed at room temperature or during isothermal low-cycle fatigue tests suggests a similar brittle failure mechanism, due to the presence of large interdendritic carbides in the cast steel.The melting of the cast steel surface using a gas tungsten arc welding (GTAW) process allowed to refine the primary carbides, and then to reduce the weld-cracking sensitivity. The 2 refining method with GTAW before welding has been successfully tested to weld-repair a sample representative of SPF dies, and is recommended for subsequent repairs of such dies.

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Section: Introductionmentioning

confidence: 99%

Analysis of weld-cracking and improvement of the weld-repair process of superplastic forming tools

Duchosal

Deschaux-Beaume

Lours

et al. 2013

Materials & Design (1980-2015)

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“…However, the annealing temperature must be very high to allow complete dissolution, i.e. above 1200 • C. Another possibility consists in using a buttering technique so as to deposit a soft intermediate layer, which can accommodate thermal strains and release stresses (Ebert, 1976), but this technique does not always prevent cracking (Haro et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Study and prevention of cracking during weld-repair of heat-resistant cast steels

Branza

Deschaux-Beaume

Sierra

et al. 2009

Journal of Materials Processing Technology

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“…10,11) Functions of HIP processes include defect healing of castings, removal of internal porosity, diffusion bonding of dissimilar materials, improvement in property scatter and mechanical properties. [12][13][14] In this study, we were afraid that the Cr-Si target would react with nitrogen or oxygen during HIP, thus we used argon as the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Effects of HIP Treatment on the Microstructure and Properties of Cr35-Si65 Target

et al. 2009

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Hot Isostatic Pressing (HIP) can be used for upgrading castings, densifying pre-sintered components, consolidating powders, and interfacial bonding. Hot pressing is a good method for fabricating on high melting materials with better mechanical properties. Commercial ashp treated Cr35-Si65 targets are used throughout this study. The aim of this paper is to discuss the methods and to find a suitable HIP treatment for the as-hp treated Cr35-Si65 target. Meanwhile, we also to evaluate the effects of HIP treatment on the microstructure and properties of Cr35-Si65 target. The experiment results show that HIP treatment at 1100 C under 175 MPa for 2 hours of Cr35-Si65 target is the most suitable condition. It can reduce the open pore porosity by 20% and close pore porosity by 30%. The density could be increased to 3:64 Â 10 À3 kg/m 3 .

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Study of weldability of a Cr–Si modified heat-resisting alloy

Cited by 13 publications

References 5 publications

Analysis of weld-cracking and improvement of the weld-repair process of superplastic forming tools

Analysis of weld-cracking and improvement of the weld-repair process of superplastic forming tools

Study and prevention of cracking during weld-repair of heat-resistant cast steels

Effects of HIP Treatment on the Microstructure and Properties of Cr35-Si65 Target

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