Transformation characteristics of medium carbon V – Ti – N microalloyed steel for non-quenched/tempered oil well tubes

Abstract

The phase transformation points of a medium carbon V -Ti -N microalloyed steel were determined, as were the continuous cooling transformation curves of austenite heated at 1100°C without deformation and heated at 1200°C with two pass deformation. The data have been further used to analyse the real production scheme of N80 grade hot rolled non-quenched/tempered seamless tubes. The results have showed clearly that the commonly used 'in line normalisation' is not always necessary in the non-quenched/tempered production process of N80 grade hot rolled seamless oil well tubes. The above viewpoint has been further demonstrated by the microstructural examination of specimens sampled from industrial production.MST/5688

Recent Development in Multiscale Simulation of Mechanical Properties at Material Interface

“…The simplest solution is to use the same potential form as bulk material by only modifying the parameters in the potential function. The embedded atom method (EAM) potentials of Ag/Ni and Cu/Ni interfaces [5], the pair potential of Cu/Al2O3 interface [6] were built in this way. The recent advance of density functional theory (DFT) has greatly benefited researcher for ab initio first-principles studies of solid materials.…”

Three-dimensional thermomechanical coupled FEM analysis of static recrystallisation during two-pass tube tension reducing process

“…In recent years, with the frequent modification of finite element method (FEM) and the development of computer techniques, numerical simulations have become an increasingly powerful tool in the study of hot rolling metals and forge processes. [1][2][3][4][5] Especially, its application in the simulation of the tension reducing process, which is an important and complicated procedure in the production of seamless steel tube, can effectively conquer the difficulties occurred in physical experiments and provide the researchers with much more critical information. The main characteristics for tension reducing process lie in its continuous two-or three-roller multistand mandrelless longitudinal rolling.…”