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首页> 外文期刊>Journal of Materials Engineering and Performance >Optimal Weld Parameters, Weld Microstructure, Mechanical Properties, and Hydrogen Absorption: An Effective Analysis
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Optimal Weld Parameters, Weld Microstructure, Mechanical Properties, and Hydrogen Absorption: An Effective Analysis

机译：最佳焊接参数，焊接组织，力学性能和氢吸收：有效分析

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摘要

Weld bead-in-grooves were deposited on low alloy, high strength steel plates (ASTM A 517 Grade “F”) with a commercial flux-cored filler wire, Auto-MIG 420, at different welding conditions. Microstructure and mechanical properties of welds were characterized by means of optical microscopy, SEM, TEM, EPMA, microhardness measurements, tensile tests, and Charpy impact tests. Hydrogen content of weld metals in as-weld condition and after exposing in simulated service condition was measured by LECO Gas Analyzer. Microstructure of weld metals consisted primarily of lath martensite with small amount of M-A constituents (Martensite-Austenite alternating layers). For some particular welding conditions, such as higher heat input and lower preheat temperatures etc., acicular ferrite is observed with lath martensite. Welds consisting of acicular ferrite in the microstructure showed improved mechanical properties as well as lower hydrogen absorption. The study provides guidelines for selecting proper welding conditions, which results in lower propensity to absorb hydrogen during service, as well as better mechanical properties. Necessity of post-weld heat treatment processes, which is mainly performed to achieve toughness, may be reduced; consequently saving cost and time of the welding process.
机译：在不同的焊接条件下，使用商用药芯焊丝Auto-MIG 420在低合金高强度钢板（ASTM A 517等级“ F”）上沉积焊缝中的焊缝。通过光学显微镜，SEM，TEM，EPMA，显微硬度测量，拉伸试验和夏比冲击试验对焊缝的显微组织和力学性能进行了表征。用LECO气体分析仪测量焊接状态下和暴露于模拟使用条件下的焊接金属中的氢含量。焊缝金属的显微组织主要由板条马氏体组成，并具有少量的M-A成分（马氏体-奥氏体交替层）。对于某些特定的焊接条件，例如较高的热量输入和较低的预热温度等，板条马氏体会观察到针状铁素体。在显微组织中由针状铁素体组成的焊缝具有改善的机械性能以及较低的氢吸收率。该研究为选择合适的焊接条件提供了指导，从而降低了维修期间吸收氢的倾向以及更好的机械性能。可以减少主要用于实现韧性的焊后热处理工艺的必要性；因此节省了焊接过程的成本和时间。

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