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Microstructure and Toughness of 1000 MPa High Strength Weld Metal

机译：1000MPa高强度焊缝金属的微观结构和韧性

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摘要

Welding of 1000 MPa high strength alloy steel is difficult because of its welding cold cracking sensitivity and the difficulty in maintaining high joint toughness. In this paper the effects of alloy elements on welding cracking tendency are analyzed, and measures to prevent cold crack are proposed. Welding wires with high strength was deposited into weld metal and welded into joint. Tensile test, micro-hardness test and Charpy impact test were used to evaluate the strength and toughness of weld metal and heat affected zone. Optical microscope, transmission electron microscope and scanning electron microscope were used to analyze the microstructure. It is shown that the weld metal mainly consists of lath martensite, lath bainite, and residual austenite which exists between the laths. The strength of weld metal increases in a small degree with increasing carbon equivalent and its toughness and ductility are not related to carbon equivalent. The toughness and ductility are much sensitive to nonmetallic inclusions. The welded joint has tensile strength of higher than 1000 MPa when welded at heat input of 11 kJ/cm and 15 kJ/cm and the mechanical properties are little influenced by the amount of heat input in this range. The whole welded joint has good comprehensive properties.
机译：由于其焊接冷裂纹敏感性和难以保持高关节韧性，焊接1000MPa的高强度合金钢是困难的。本文分析了合金元素对焊接开裂趋势的影响，提出了预防冷裂纹的措施。具有高强度的焊接线沉积到焊接金属中并焊接到接头中。拉伸试验，微硬度试验和夏比冲击试验用于评估焊接金属和热影响区的强度和韧性。光学显微镜，透射电子显微镜和扫描电子显微镜用于分析微观结构。结果表明，焊接金属主要由板条马氏体，板岩贝氏体和残留的奥氏体组成，在板条之间存在。焊接金属强度在较小程度上增加，碳当量增加，其韧性和延展性与碳等同物无关。韧性和延展性对非金属夹杂物敏感。当在11kJ / cm的热输入时焊接时，焊接接头具有高于1000MPa的拉伸强度，15kJ / cm，机械性能几乎受到该范围内的热量输入的影响很小。整个焊接接头具有良好的综合性质。

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