论文部分内容阅读
一、前言含铜低合金钢具有良好的机械性能和突出的抗大气等腐蚀能力,很早以来就受到世界各国注意。人们先后开发了各种强度级别的一系列含铜钢。结合我国矿产资源发展起来的含铜低合金钢,多年来也广泛地应用于桥梁、船舶、车辆、压力容器等焊接结构,其中以含铜16锰钢最为普遍。随着低合金高强度钢的大量发展和广泛地用于焊接结构,钢材的冷裂缝敏感性成了最令人关注的可焊性指标。冷裂机理的大量研究表明,低塑性组织、拘束应力和扩散氢是冷裂缝形成的三大原因,并被称为冷裂三要素。
First, the preface Copper low alloy steel with good mechanical properties and outstanding anti-atmospheric corrosion and other capabilities, has long been the attention of all countries in the world. People have successively developed a series of copper-containing steels of various strength levels. Copper-bearing low-alloy steel developed in combination with China’s mineral resources has been widely used in bridges, ships, vehicles, pressure vessels and other welding structures for many years. Among them, copper-bearing 16 manganese steel is the most common. With the development of low-alloy high-strength steels and the extensive use of welded structures, the cold crack sensitivity of steels has become the most attractive solderability index. A large number of studies on the mechanism of cold cracking show that low plasticity, confinement stress and diffusion of hydrogen are the three major causes of cold crack formation and are called as three elements of cold cracking.