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首页> 外文期刊>Metals >Microstructure and Properties of Hybrid Laser Arc Welded Joints (Laser Beam-MAG) in Thermo-Mechanical Control Processed S700MC Steel
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Microstructure and Properties of Hybrid Laser Arc Welded Joints (Laser Beam-MAG) in Thermo-Mechanical Control Processed S700MC Steel

机译：热机械控制加工S700MC钢中混合激光弧焊接头（激光束-MAG）的组织和性能

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The article presents the microstructure and properties of joints welded using the Hybrid Laser Arc Welding (HLAW) method laser beam-Metal Active Gas (MAG). The joints were made of 10-mm-thick steel S700MC subjected to the Thermo-Mechanical Control Process (TMCP) and characterised by a high yield point. In addition, the welding process involved the use of solid wire GMn4Ni1.5CrMo having a diameter of 1.2 mm. Non-destructive tests involving the joints made it possible to classify the joints as representing quality level B in accordance with the ISO 12932 standard. Destructive tests of the joints revealed that the joints were characterised by tensile strength similar to that of the base material. The hybrid welding (laser beam-MAG) of steel S700MC enabled the obtainment of good plastic properties of welded joints. In each area of the welded joints, the toughness values satisfied the criteria related to the minimum allowed toughness value. Tests involving the use of a transmission electron microscope and performed in the weld area revealed the decay of the precipitation hardening effect (i.e., the lack of precipitates having a size of several nm) and the presence of coagulated titanium-niobium precipitates having a size of 100 nm, restricting the growth of recrystallised austenite grains, as well as of spherical stable TiO precipitates (200 nm) responsible for the nucleation of ferrite inside austenite grains (significantly improving the plastic properties of joints). The tests demonstrated that it is possible to make welded joints satisfying quality-related requirements referred to in ISO 15614-14.
机译：本文介绍了使用混合激光电弧焊（HLAW）方法激光束-金属活性气体（MAG）焊接的接头的组织和性能。接头由厚度为10毫米的S700MC钢制成，并经过热机械控制工艺（TMCP），并且具有很高的屈服点。此外，焊接过程涉及使用直径为1.2毫米的实心焊丝GMn4Ni1.5CrMo。涉及关节的非破坏性测试可以根据ISO 12932标准将关节分类为代表质量等级B。接头的破坏性测试表明，接头的拉伸强度与基材相似。 S700MC钢的混合焊接（激光束MAG）可实现焊接接头的良好塑性。在焊接接头的每个区域，韧性值均满足与最小允许韧性值有关的标准。涉及使用透射电子显微镜并在焊缝区域进行的测试表明，沉淀硬化作用的减弱（即，缺乏几纳米大小的沉淀）和存在尺寸为的凝结的钛铌沉淀。 100 nm，限制了再结晶奥氏体晶粒的生长，以及球形稳定的TiO沉淀物（200 nm），该沉淀物负责奥氏体晶粒内部的铁素体形核（显着改善了接头的塑性）。测试表明，可以使焊接接头满足ISO 15614-14中与质量相关的要求。

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