This study investigated the effects of the hot isostatic pressing process on the crack healing, microstructure, and mechanical properties of the laser repair-welded CM247LC precipitation-hardened superalloy. To ensure the strength of the repair-welded area, this study used the direct re-melting approach, and simulated the repair welding with the filler addition, which has a chemical composition...

K465 superalloy with high titanium and aluminum contents was easy to crack during laser metal deposition. In this study, the crack-free sample of K465/Stellite-6 laminated material was formed by laser metal deposition shaping to control the cracking behaviour in laser metal deposition of K465 superalloy. The microstructure differences between the K465 superalloy with cracking and the laminated ...

Convective instabilities responsible for misoriented grains (freckle defects) in directionally solidified turbine airfoils are produced by variations in liquid–metal density with composition and temperature across the solidification zone. Here, fundamental properties of molten Ni-based alloys, required for modeling these instabilities, are calculated using ab initio molecular dynamics simulatio...

As shown in the preceding chapter, simple binary eutectic Ni-Hf and Ni-Zr braze alloys can be used to successfully join In738 Ni-base superalloy. The joint gap must, however, be narrow (less than 0.15 mm in width) to allow capillary action to draw the filler metal into the joint. Such narrow joint gaps are usually only found in the manufacturing industry. In the repair industry, especially in I...

The effects of microstructures during creep on the ultrasonic attenuation have been investigated for Ni based superalloy (IN738LC). The cuboidal γ′ precipitates in the virgin material became coarsened preferentially in the direction perpendicular to the applied stress axis as creep time increased. The length of γ′ precipitates increased with creep time, while the width increased slightly. The i...

In this study, we investigated the microstructural evolution, surface hardening and general corrosion properties of a precipitation-strengthened Inconel 718 Ni-superalloy after triode-plasma nitriding (TPN) at low treatment temperatures 400–450 °C (i.e. thermodynamic paraequilibrium conditions) high temperature 700 °C. At temperatures, apart from formation nitrogen-expanded austenite (? N ) hig...

Background: Gestational Trophoblastic Disease (GTD) is a heterogeneous group of diseases that includes partial and complete hydatidiform mole, invasive choriocarcinoma placental site trophoblastic tumour. The study aimed to determine the clinical presentation management options outcome GTD in patients admitted tertiary hospital Bangladesh.
 Materials methods: This prospective observational...

Abstract Objective To provide guidelines for surgery and reduce the incidence of fracture, this study analyzed relationship between femoral fracture related factors in direct anterior approach (DAA) total hip arthroplasty (THA) lateral decubitus position. Method A retrospective series 273 consecutive patients who underwent THA with DAA position was analyzed. Each performed by same surgeon a con...

Gestational trophoblastic disease is a spectrum of placental disorders ranging from benign molar pregnancies to the neoplastic conditions such as invasive mole and choriocarcinoma. These patients are identified early due to markedly elevated hCG levels and characteristic ultrasound findings. Uterine evacuation is the recommended treatment, while chemotherapy can be reserved for patients with re...