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首页> 外文会议>New developments on metallurgy and applications of high strength steels >MICROSTRUCTURE EVOLUTION, CREEP DAMAGE MECHANISMS AND LIFE PREDICTION OF HIGH CHROMIUM MARTENSITIC STEEL ASTM GRADES 91 AND 92
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MICROSTRUCTURE EVOLUTION, CREEP DAMAGE MECHANISMS AND LIFE PREDICTION OF HIGH CHROMIUM MARTENSITIC STEEL ASTM GRADES 91 AND 92

机译：高铬马氏体ASTM等级91和92的组织演变，蠕变损伤机理和寿命预测

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摘要

Creep resistance is a fundamental requirement for materials specifically tailored for working at high temperature, under stress conditions. Current engineering approaches used to describe creep behavior are traditionally based on empirical relationships, derived from experimental databases. In this work, a new time independent formulation, based on Continuum Damage Mechanics (CDM) originally presented by Bonora et al. (Bonora N., Di Cocco V. and Gentile D.: “Advanced CDM Strain-Based Modeling For II+III Creep Under Multiaxial State Of Stress”, Proc. of the 9th Int. Conf. on Materials, ICM9, Geneva, 2003) has been developed and a constitutive model, based on the specific micromechanisms which cause the irreversible processes responsible for the material failure, derived. In this formulation, the kinetic law of creep damage evolution depends only on accumulated inelastic strain and stress triaxiality and not on time needed to reach a specific deformation level. The new constitutive model has been specialized to high chromium ferritic steels ASTM grades 91 and 92. The microstructure evolution during high temperature service, such as the nucleation, growth and coarsening of secondary phases, as Laves and Z-phases, has been incorporated in the model formulation by appropriate modification of the damage parameters mathematical formulation. These have been determined from experimental data up to 10,000 creep hours only. Long term creep lives up and beyond 100,000 hours in the temperature range 550°C-650°C have been successfully predicted with h igh degree of accuracy.
机译：耐蠕变性是专门为应力条件下的高温工作量身定制的材料的基本要求。传统上，用于描述蠕变行为的当前工程方法通常基于从实验数据库中得出的经验关系。在这项工作中，基于Bonora等人最初提出的连续损伤力学（CDM），提出了一种新的与时间无关的公式。 （Bonora N.，Di Cocco V.和Gentile D .：“在多轴应力状态下基于II + III蠕变的先进CDM应变建模”，第9届国际材料大会，ICM9，日内瓦，2003年）已经开发出了本构模型，并基于特定的微力学原理建立了本构模型，这些微力学机理导致了造成材料破坏的不可逆过程。在此公式中，蠕变损伤演化的动力学规律仅取决于累积的非弹性应变和应力三轴性，而不取决于达到特定变形水平所需的时间。新的本构模型专门针对ASTM 91和92级的高铬铁素体钢。高温条件下的微观组织演变，例如Laves和Z相等次级相的成核，生长和粗化，已被并入。通过适当修改损伤参数的数学公式来建立模型公式。这些是根据实验数据确定的，最多只能达到10,000蠕变小时。已经成功地高度准确地预测了在550°C-650°C温度范围内的长期蠕变寿命并超过100,000小时。

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  • 来源
  • 会议地点 Buenos Aires(AR)
  • 作者

    L. Cipolla; P. Lombardi; P. Folgarait; A. Di Gianfrancesco; N. Bonora; L. Esposito; G. Cumino; S. Caminada;

  • 作者单位

    CSM – Centro Sviluppo Materiali SpA, via di Castel Romano, 100 – I-00128 Rome - Italy;

    CSM – Centro Sviluppo Materiali SpA, via di Castel Romano, 100 – I-00128 Rome - Italy;

    CSM – Centro Sviluppo Materiali SpA, via di Castel Romano, 100 – I-00128 Rome - Italy;

    CSM – Centro Sviluppo Materiali SpA, via di Castel Romano, 100 – I-00128 Rome - Italy;

    DiMSAT – Dept. of Mechanics, Structures Environment, University of Cassino, via G. Di Biasio, 43 – I-03042 Cassino (FR) - Italy;

    DiMSAT – Dept. of Mechanics, Structures Environment, University of Cassino, via G. Di Biasio, 43 – I-03042 Cassino (FR) - Italy;

    TenarisDalmine – P.zza Caduti 6 Luglio 1944, 1 – I-24044 Dalmine (BG) - Italy;

    TenarisDalmine – P.zza Caduti 6 Luglio 1944, 1 – I-24044 Dalmine (BG) - Italy;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 碳素钢;
  • 关键词

    ASTM Grade 91 and 92; creep; CDM; microstructural evolution;

    机译：ASTM 91和92级;蠕变; CDM;微观结构演变;

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