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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Variation in the Chemical Driving Force for Intragranular Nucleation in the Multi-pass Weld Metal of Ti-Containing High-Strength Low-Alloy Steel
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Variation in the Chemical Driving Force for Intragranular Nucleation in the Multi-pass Weld Metal of Ti-Containing High-Strength Low-Alloy Steel

机译：含钛高强度低合金钢多道次焊接金属中晶内形核化学驱动力的变化

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摘要

The variation of the Mn-depleted zone (MDZ) around the inclusion during multi-pass welding of Ti-containing high-strength low-alloy (HSLA) steel was investigated by taking the changes in the impact toughness and microstructure into account. As-deposited weld metal specimens were prepared by single-pass, bead-in-groove welding, and reheated weld metal specimens were obtained by a thermal simulation technique. Two types of chemical compositions were prepared, mainly by controlling the Ti content in order to form two types of phases at inclusion/matrix interface: spinel and ilmenite. When the reheating thermal cycle is applied to the as-deposited weld metal, the MDZ depth varied depending on the inclusion surface phase; this could be explained by the competition of the homogenization effect and the dissolution effect, which occurred near the inclusion/matrix interface. In order to enhance the chemical driving force for intragranular nucleation in both as-deposited weld metal and reheated weld metal, the formation of ilmenite phase is recommended. (C) The Minerals, Metals & Materials Society and ASM International 2015
机译：通过考虑冲击韧性和显微组织的变化，研究了含钛高强度低合金（HSLA）钢多道次焊接过程中夹杂物周围的贫锰区（MDZ）的变化。通过单道，槽内焊的方式制备沉积的焊接金属试样，并通过热模拟技术获得再加热的焊接金属试样。制备两种化学成分，主要是通过控制Ti含量以在夹杂物/基体界面形成两种相：尖晶石和钛铁矿。当再热循环应用于沉积的焊缝金属时，MDZ深度随夹杂物表面相的变化而变化。这可以通过均质作用和溶解作用之间的竞争来解释，这种竞争发生在包含/基质界面附近。为了增强沉积的焊缝金属和再加热的焊缝金属中晶内形核的化学驱动力，建议形成钛铁矿相。 （C）矿物，金属和材料学会和ASM International 2015

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