Some recent developments in modelling of heat‐treatment phenomena in steel within the collaborative research centre SFB 570 “Distortion Engineering”

Abstract

Some recent developments in modelling of heat-treatment phenomena in steel within the collaborative research centre SFB 570 "Distortion Engineering"Einige aktuelle Entwicklungen in der Modellierung von Phänomenen der Wärmebehandlung beim Stahl im Sonderforschungsbereich SFB 570 "Distortion Engineering"It is the aim to present some developments in modelling of distortion-related phenomena during heat treatment of steel in the context of the Collaborative Research Centre SFB 570 "Distortion Engineering" at the Bremen University, Germany. Taking this into account, a survey will be given and some results will be exemplarily presented. This work is the first contribution to the session "Modelling of material behaviour within the CRC Distortion Engineering" of the 3 Bökenheide et al. 2011 [2] deal in detail with the steel qualities 100Cr6 (SAE 52100) and 20MnCr5 (SAE 5120), respectively. Here, more general aspects of the subsequent phenomena are in the focus: Phase transformations (PT) and transformation-induced plasticity (TRIP) during quenching and heating, plastic behaviour of (supercooled) austenite as well as creep during heating and austenitising. The following items will be considered in particular: Experiments and processing strategies for experimental data, model approaches and results for single phenomena of material behaviour. Many assertions have a general character not linked to special steel sorts. We will also address open questions and possible perspectives. IntroductionIt is the aim to present the development of modelling of steel phenomena which are relevant to distortion of work-pieces during heat treatment in the context of the Collaborative Research Centre SFB 570 "Distortion Engineering" at the University of Bremen. The main concept of this long-time research project (started in 2001) is a system-oriented view on distortion. For a comprehensive explanation we refer to [3].

Experimental Researches of Carbon Steels Plasticity Changes in the Field of Phase Transformations

“…Отсутствие температурной зависимости магнитной восприимчивости при температуре выше температуры фазового перехода может быть связано как с низкой температурой вырождения, так и с узкой d-полосой и высокой плотностью электронных состояний вблизи уровня Ферми, характерной для соединений ванадия [6]. Проблемы состояния предпревращения при диффузионных и бездиффузионных фазовых переходах в металлах и сплавах являются предметом детальных исследований представителей отечественных и зарубежных ведущих научных школ [1][2][3][4][5], особенно в последнее десятилетие [6][7][8][9][10], т.к. их решения показывают возможности приобретения новых знаний о структуре кристаллических тел, активированном состоянии атомов, механизмах изменения физических и механических свойств, устойчивости кристаллических структур сплавов, закономерностях возникновения и развития экстремальных эффектов, определении оптимальных режимов их реализации при различном внешнем сопряжённом температурном, механическом и физико-химическом воздействии [11][12][13][14].…”

Modelling of phase transformations and transformation plasticity of a continuous casted steel 20MnCr5 incorporating segregations

“…and " In this work three effects related to phase transformations will be discussed in detail: -anisotropic transformation strain, which can be described as an inner transformation plasticity, where the triggering stress is due to directed inner stresses between the bands [9] -modifications of phase transformations due to microsegregations -transformation plasticity Classic plasticity effects like yielding and creep will be discussed within other papers [10,11].…”

Transformation Induced Plasticity (TRIP) of SAE 52100 Steel during Martensitic and Bainitic Transformations

“…al. [14] which used a different testing equipment.…”