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Temperature distribution and effect of low-density electric current on B2+O lamellar microstructure of Ti2AlNb alloy sheet during resistance heating

Ti2AlNb合金板材自阻加热中温度分布及低电流密度对B2+O层片组织的作用

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Abstract

The resistance heating method has been one of the prospective techniques for hot processing and welding techniques. The thermal behavior under different densities of electric current and the effect of electric current at temperature of 780 °C using low density of electric current of 6.70 A/mm2 on the B2+O lamellar microstructure were investigated for Ti2AlNb alloy sheet. The stable temperature denoted a balanced state between the Joule heat and the dissipation of heat including heat conduction, convection and radiation while the distribution of temperature was nonuniform. The highest temperatures of electric current heating samples increased as the density of electric current was elevated. In order to understand the specific effect of electric current on B2+O microstructure, heat treatment for microstructural homogeneity was introduced to this study. After that, according to the microstructural observations by common characterization techniques in the resistance-heating sample and the isothermal furnace-heating sample after homogenizing treatment, few significant differences in content and orientation of phases can be directly and explicitly found except the thermal effect from the applied electric current. The results will provide reference to this prospective forming and welding techniques and the application for Ti2AlNb alloys using resistance heating in the near future.

摘要

自阻加热技术是在热加工和焊接领域中具有潜力的加热方式。本文研究了不同电流密度下的 Ti2AlNb合金板材的自阻加热行为和在6.70 A/mm2低电流密度,最高温度为780 °C时,电流密度对 Ti2AlNb合金板材B2+O双相组织的作用。自阻加热时稳定的温度场意味着焦耳热和由热传导、热对 流和热辐射引起的耗散热量的一种平衡,而此时的板材温度分布不均匀。板材自阻加热时的最高温度 随着电流密度的提高而逐渐增加。为确切地研究电流对Ti2AlNb合金板材中B2+O相的作用,采用了 均匀化热处理。通过表征均匀化热处理后自阻加热试样和等温度下的炉温加热试样的组织发现,除了 电流直接带来的热效应,没有明确地发现0相、α2相和B2基体相的含量和取向上的差异。本研究可 以为Ti2AlNb合金板材在电流辅助热成形及焊接方面提供参考,为未来的Ti2AlNb合金的自阻加热应 用提供实验基础。

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Authors and Affiliations

  1. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, China

    Guo-feng Wang  (王国峰), Xiao Li  (李骁), Dan-feng Li  (李丹峰), Yi-bin Gu  (顾义斌) & Hui Fang  (方慧)

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  1. Guo-feng Wang  (王国峰)
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  2. Xiao Li  (李骁)
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  3. Dan-feng Li  (李丹峰)
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Correspondence to Guo-feng Wang  (王国峰).

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Foundation item: Project(51875122) supported by the National Natural Science Foundation of China

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Wang, Gf., Li, X., Li, Df. et al. Temperature distribution and effect of low-density electric current on B2+O lamellar microstructure of Ti2AlNb alloy sheet during resistance heating. J. Cent. South Univ. 26, 550–559 (2019). https://doi.org/10.1007/s11771-019-4026-6

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