Phase transformations in the heat-affected zone of microalloyed steels

微合金钢热影响区的相变

基本信息

  • 批准号:
    RGPIN-2020-04226
  • 负责人:
  • 金额:
    $ 2.4万
  • 依托单位:
  • 依托单位国家:
    加拿大
  • 项目类别:
    Discovery Grants Program - Individual
  • 财政年份:
    2020
  • 资助国家:
    加拿大
  • 起止时间:
    2020-01-01 至 2021-12-31
  • 项目状态:
    已结题

项目摘要

The long-term objective of this program is to develop the physical metallurgy for next generation steel welds for fossil-fuel and renewable energy. The short-term research objectives are to develop a theory for non-equilibrium phase transformations in X70 pipeline steel thermally cycled to lower or upper critical temperatures, and to optimize the low-temperature toughness by controlling the multipass weld heat-affected zone microstructure. Welding generates the heat- affected zone, the most critical of which is the coarse- grained zone, which has long been identified as the location for “local brittle zone” for poor toughness. More recently the inter-critical heat -affected zone, where the peak temperature during welding falls between the lower (Ac1) and upper (Ac3) critical temperatures for austenite formation, has been correlated with the “soft zone” for Type IV damage in welded boiler tubes. The cooling rate effect has been well understood through the CCT diagrams. However, a quantitative prediction of phase transformations is not available for the effects of weld heating rates, peak temperature, and various starting microstructure. The following research themes are proposed: Theme 1: Thermal History of Multipass Welding Conduct welding tests, and characterize the thermal cycles typical for the intercritical heat-affected zone for arc welding. Numerical thermal simulations will be conducted to understand the temperature fields as influenced by the weld geometry and heat input. Theme 2: Non-Conventional CCT Diagrams Reproduce the thermal cycles on X70 steel using the Gleeble and a quench dilatometer. Simulate and measure the effects of pre-existing microstructure, heating/cooling rates, austenite grain sizes, dissolution of carbides, and homogenization on subsequent on-cooling transformations. Theme 3: A Model for Multipass Welds and Additive Manufacturing By characterizing the resulting microstructure of the Gleeble samples, the appearance of bainite peak if particles have dissolved, or the appearance of allotriomorphic ferrite peak if particles have not completely dissolved, we will develop a microstructural evolution model for optimizing the impact toughness by quantifying the peak temperatures on austenite formation and carbonitride dissolution (on--heating), and ferritic- type transformations (on--cooling). The scientific findings will contribute to materials engineering and physical metallurgy by providing new knowledge on microstructure--processing--properties relationship for advanced welding of microalloyed steels. For the first time, the mechanism for the complicated heated-affected zone microstructure of multipass welds will be studied systematically and quantitatively. This research program also serves as an ideal platform to train numerous high -quality graduate students in physical metallurgy to advance their academic or career prospects.
该项目的长期目标是开发用于化石燃料和可再生能源的下一代钢材焊接的物理冶金技术。短期研究目标是建立X70管道钢热循环至较低或较高临界温度的非平衡相变理论,并通过控制多道焊缝热影响区显微组织来优化其低温韧性。

项目成果

期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)

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Li, Leijun其他文献

Transition from Type IV to Type I cracking in heat-treated grade 91 steel weldments
Microstructure characterization of laser welded Ti-6Al-4V fusion zones
激光焊接 Ti-6Al-4V 熔合区的显微组织表征
  • DOI:
    10.1016/j.matchar.2013.11.005
  • 发表时间:
    2014-01-01
  • 期刊:
  • 影响因子:
    4.7
  • 作者:
    Xu, Pei-quan;Li, Leijun;Zhang, Chunbo (Sam)
  • 通讯作者:
    Zhang, Chunbo (Sam)
Identification and Characterization of Intercritical Heat-Affected Zone in As-Welded Grade 91 Weldment
A Coupled Thermal-Mechanical Analysis of Ultrasonic Bonding Mechanism
Repair of directionally solidified superalloy GTD-111 by laser-engineered net shaping
  • DOI:
    10.1007/s10853-006-0948-0
  • 发表时间:
    2006-12-01
  • 期刊:
  • 影响因子:
    4.5
  • 作者:
    Li, Leijun
  • 通讯作者:
    Li, Leijun

Li, Leijun的其他文献

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{{ truncateString('Li, Leijun', 18)}}的其他基金

Phase transformations in the heat-affected zone of microalloyed steels
微合金钢热影响区的相变
  • 批准号:
    RGPIN-2020-04226
  • 财政年份:
    2022
  • 资助金额:
    $ 2.4万
  • 项目类别:
    Discovery Grants Program - Individual
Phase transformations in the heat-affected zone of microalloyed steels
微合金钢热影响区的相变
  • 批准号:
    RGPIN-2020-04226
  • 财政年份:
    2021
  • 资助金额:
    $ 2.4万
  • 项目类别:
    Discovery Grants Program - Individual
Improving low-temperature weld seam toughness of electric resistance welded X70 line pipe
提高X70管线管电焊缝低温韧性
  • 批准号:
    507455-2016
  • 财政年份:
    2019
  • 资助金额:
    $ 2.4万
  • 项目类别:
    Collaborative Research and Development Grants
Physical Metallurgy for Superior Toughness of Pipeline Welds - Intercritical phase transformations in microalloyed high-strength steels
物理冶金学使管道焊缝具有优异的韧性 - 微合金高强度钢的临界相变
  • 批准号:
    RGPIN-2019-04240
  • 财政年份:
    2019
  • 资助金额:
    $ 2.4万
  • 项目类别:
    Discovery Grants Program - Individual
Improving low-temperature weld seam toughness of electric resistance welded X70 line pipe
提高X70管线管电焊缝低温韧性
  • 批准号:
    507455-2016
  • 财政年份:
    2018
  • 资助金额:
    $ 2.4万
  • 项目类别:
    Collaborative Research and Development Grants
Microstructural Development and Performance of Welds in Energy-Related Alloys
能源相关合金焊缝的微观结构发展和性能
  • 批准号:
    RGPIN-2014-03767
  • 财政年份:
    2018
  • 资助金额:
    $ 2.4万
  • 项目类别:
    Discovery Grants Program - Individual
Physical metallurgy for toughness of 1% Cr abrasion resistant steel for grinding ball stock
物理%20冶金%20for%20韧性%20of%201%%20Cr%20耐磨%20耐磨%20钢%20for%20研磨%20球%20库存
  • 批准号:
    477559-2014
  • 财政年份:
    2017
  • 资助金额:
    $ 2.4万
  • 项目类别:
    Collaborative Research and Development Grants
Microstructural Development and Performance of Welds in Energy-Related Alloys
能源相关合金焊缝的微观结构发展和性能
  • 批准号:
    RGPIN-2014-03767
  • 财政年份:
    2017
  • 资助金额:
    $ 2.4万
  • 项目类别:
    Discovery Grants Program - Individual
Improving low-temperature weld seam toughness of electric resistance welded X70 line pipe
提高X70管线管电焊缝低温韧性
  • 批准号:
    507455-2016
  • 财政年份:
    2017
  • 资助金额:
    $ 2.4万
  • 项目类别:
    Collaborative Research and Development Grants
Accelerated development of welding electrodes for abrasion-corrosion resistant overlay
加速开发耐磨腐蚀堆焊焊条
  • 批准号:
    503423-2016
  • 财政年份:
    2017
  • 资助金额:
    $ 2.4万
  • 项目类别:
    Collaborative Research and Development Grants

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