The effects of impurities on the intergranular penetration of Bi based liquids in polycrystalline Ni at 700 C were systematically investigated. In comparison with a nominally pure Ni (99.9945%), the presence of a total amount of <0.5 at.% impurities of Mn, Fe and Si in the Ni increased the penetration length by six times when a near-equilibrium Bi–Ni liquid was applied; when an initially pure B...

This paper presents an experimental and theoretical investigation of the causes of corrosion of stack in a cement plant. In this paper, information related to metallic stack failures are given in the form of a case study in Neka Cement Plant, Mazandaran, Iran. Heavy corrosion attacks were observed on the samples of stack. The failure can be caused by one or more modes such as overheating, stres...

Hydrogen is a dangerous gas due to its low ignition energy, wide flammability range, promotion of the embrittlement steel, and high coefficient permeation for polymers. The fracture toughness failure elongation pipe steels are strongly impacted by hydrogen embrittlement, whereas yield stress ultimate strength moderately impacted. Specific tools required defect assessment used transport hydrogen...

Dehydration embrittlement of serpentine was investigated by employing triaxial deformation experiments at high pressure and temperature (P = 1–6 GPa; T = 550–820oC). A modified Griggs apparatus was used up to 3.4 GPa and a Walker-type multi-anvil apparatus was used at 3.5–6 GPa). The investigated specimen is a serpentinized peridotite from Val Malenco, Italy. Dehydration of the sample under dif...

A critical analysis is presented of the operating temperature windows for nine candidate fusion reactor structural materials: four reduced-activation structural materials (oxide-dispersion-strengthened and ferritic/martensitic steels containing 8–12%Cr, V–4Cr–4Ti, and SiC/SiC composites), copper-base alloys (CuNiBe), tantalum-base alloys (e.g. Ta–8W–2Hf), niobium alloys (Nb–1Zr), and molybdenum...

Transmission and distribution pipelines have a significant role in the oil and gas industries. Pipelines are facing different threat like corrosion, improper design and incorrect operation. Gas vapor released from a pipeline (owned by NIOC) failure spread out and reached to ignition source. Due to gas outdoor spreading, “flash fire” occurred and flame return caused “vapor cloud explosion” of ga...

• Ductile-to-brittle transition is simulated combining complete Gurson model and CZM. Brittle fracture only occurs when the ratio between cohesive strength yield below a critical value. Hydrogen embrittlement studied using this numerical framework hydrogen concentration revealed. A general simulation for modelling ductile-to-brittle in metals proposed. The method combines zone model, which brin...