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首页> 外文期刊>Journal of Materials Engineering and Performance >Investigation of Metallurgical and Mechanical Properties of Laser Beam Welded and Post-weld Heat Treated DP1400 Steel
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Investigation of Metallurgical and Mechanical Properties of Laser Beam Welded and Post-weld Heat Treated DP1400 Steel

机译：激光束焊冶金和力学性能的研究及焊接后热处理DP1400钢

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摘要

In this paper, the effect of autogenous diode laser beam welding (LBW) and the influence of post weld heat treatment (PWHT) on microstructural changes and mechanical properties of dual phase DP1400 high strength steel (HSS) butt welded joint are studied and presented. LBW and PWHT were performed on 1 mm sheet thickness using 3 and 5 kW diode laser systems, respectively. The technology ensures high quality welded joints in HSS and facilitate the welding and PWHT by same process and equipment. Microstructure evaluation was performed using optical and scanning electron microscopy. Related to the mechanical properties, tensile tests, fractography of fractured tensile specimens and three-point bending tests were carried out. The microstructural examination presented the constituents of martensite and ferrite in the heat affected zone (HAZ) and fusion zone (FZ) consists of predominantly lath martensite with ferrite and some bainite. Tempered martensite was observed after PWHT in HAZ and FZ. The hardening peaks observed in coarse-grained and fine-grained subzones were significantly reduced by the novelty technology, i.e. PWHT and thereby cold cracking sensitivity. The fractography of the fractured tensile specimens showed characteristic features of ductile failure.
机译：本文研究了双相DP1400高强度钢（HSS）对接焊接头的自组织激光束焊接（LBW）和焊后热处理（PWHT）对接头组织变化和力学性能的影响。LBW和PWHT分别使用3千瓦和5千瓦的二极管激光系统在1毫米厚的板材上进行。该技术确保了高速钢的高质量焊接接头，并有助于采用相同的工艺和设备进行焊接和焊后热处理。使用光学和扫描电子显微镜进行微观结构评估。与力学性能相关，进行了拉伸试验、断裂拉伸试样的断口分析和三点弯曲试验。显微组织检查显示，热影响区（HAZ）和熔合区（FZ）中的马氏体和铁素体成分主要由板条马氏体、铁素体和一些贝氏体组成。热影响区和FZ焊后热处理后观察到回火马氏体。新技术（即焊后热处理）显著降低了粗晶和细晶亚区中观察到的硬化峰，从而降低了冷裂纹敏感性。断裂拉伸试样的断口形貌显示出韧性破坏的特征。

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