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Efect of heat treatment parameters on microstructure evolution, tensile strength, wear resistance, and fracture behavior of Ni-Ti multilayered composites produced by cross‑accumulative roll bonding

Ye Qing, Li Xuejun, Tayyebi Moslem, Assari Amir Hossein, Polkowska Adelajda, Lech Sebastian, Polkowski Wojciech, Tayebi Morteza

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 1

art. no. e27, 2023

The last decades have seen a huge growth in the investigation of intermetallic compounds at the interfaces of laminated composites due to their useful features. In this research, efects of the formation of intermetallic compounds on tensile properties and wear resistance of Ni/Ti composites produced by cross-accumulative roll bonding (CARB) process have been examined at diferent annealing times and temperatures. Scanning electron microscopy (SEM) images demonstrated that the layers were well bonded together, but Ni layers experienced instabilities in light of plastic deformation. The EBSD results showed lamellar structure and crystallographic texture on Ti and Ni layers during plastic deformation. According to X-ray difractometer (XRD) and energy-dispersive spectrometer (EDS) analyses, NiTi2 and NiTi were present in all annealed samples. The thickness of intermetallic compounds grew with an increase in annealing temperature and time. However, this growth led to a decrease in tensile strength while the values of elongation fuctuated. Based on the results of the wear test, the composite became more resistant to wear when the thickness of intermetallic layers increased. The surfaces of these layers with less roughness and lower coefcients of friction facilitated the movement of steel pin on samples during the wear test. Furthermore, wear mechanisms of adhesion, abrasion, and delamination were observed, and they were more noticeable at higher loads and lower annealing temperatures and times.

Analysis of annealing on the micro‑porosity and ductility of squeeze‑casted Al7050 alloy for the structural applications

Mufti Nadeem Ahmad, Islam Moiz ul, Ali Muhammad Asad, Raza Muhammad Huzaifa, Ahmed Naveed

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 3

art. no. e107

Squeeze casting has emerged as an attractive alternative for the casting of aluminum alloys to boost the mechanical and microstructural attributes. However, the alloys practiced in structural applications where ductility is considered a key characteristic, additional heat treatment processes are opted after casting. Considering the industrial applications of Al7050, the current study focused on manufacturing defect-free casting for structural applications. For this purpose, three key process variables including squeeze pressure (SP), melt temperature (MT) and die temperature (DT) have been preferred to improve the percentage elongation, ultimate tensile strength and hardness with minimal casting defects. Annealing treatment is preferred to further advance the ductile behavior of the squeeze-casted Al7050 alloy. Among different process variables, SP has a significant contribution in raising the mechanical properties followed by MT and DT. Taguchi-based Grey relational analysis (GRA) has been used to attain the optimal level of input parameters (SP = 135 MPa, MT, 740 °C and DT = 240 °C) for the superior microstructural and mechanical attributes simultaneously. Microstructural investigations revealed that application of high SP and DT with reasonable MT significantly improved the grain structure and minimized the typical casting defects including micro-voids, porosity and shrinkage cavities. Annealing treatment has been observed productive for improving ductility and reducing the casting defects specifically micro-porosity.

Badania metalograficzne adhezji powłoki ochronnej na żeliwnych rurach wodociągowych

Dąbrowski W., Wassilkowska A.

Gaz, Woda i Technika Sanitarna

2018

Nr 9

334--338

Badania jakości przewodów żeliwnych dostarczanych na duże place budowy są istotne z uwagi na ich trwałość i funkcjonalność. Jednakże interpretacja tych badań nastręcza trudności. Dlatego w artykule omówiono doświadczenia autorów w zakresie trudności w interpretacji zdjęć pęknięć pomiędzy warstewkami rdzy powstałej na ścianach przewodów żeliwnych w czasie ich wyżarzania oraz przedstawiono argumenty przemawiające za tym, że lepiej jest prowadzić badania wytrzymałościowe na prostokątnych próbkach wyciętych podłużnie ze ściany przewodów, niż na próbkach o przekroju kołowym.

The quality tests of ductile iron pipes delivered to large construction sites are important for the pipes durability and functionality. However, the interpretation of those tests is found to be difficult. In a present paper, the authors' experience in the interpreting of crack pictures between the layers of rust, formed on the walls of cast iron pipes during annealing has been discussed. There are indications that it would be better to carry out the strength tests on rectangular samples, cut out lengthwise from the pipe wall, instead on the tensile samples with a circular cross-section.