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101.
Tadeu Messias Donizete Borba Wagner Duarte Flores Leonardo de Oliveira Turani Ronaldo Cardoso Junior 《Welding International》2017,31(3):184-195
High heat input welding is one of the alternatives adopted by the world’s major shipyards for increasing productivity in operations for joining materials in shipbuilding. However, the thermal cycles generated during welding may cause microstructural transformations that are detrimental to the mechanical properties, mainly toughness in the heat-affected zone (HAZ). The main aim of this study was characterization of the microstructure and assessment of the mechanical properties of the HAZ of EH36 shipbuilding steel produced by controlled rolling followed by accelerated cooling (Thermo Mechanical Control Process (TMCP) – thermo-mechanically controlled process) compared to a steel of the same grade produced by conventional rolling, both welded by the submerged arc process with two levels of heat input: 76 and 130 kJ/cm. It was observed that the presence of a more refined microstructure in the different regions of the HAZ, associated with the smaller grain size of the base metal and the lower carbon equivalent, were the main factors contributing to the excellent toughness of the HAZ of TMCP steel compared to conventional steel. The results achieved show that it is possible to obtain welded joints with excellent mechanical properties and toughness when using TMCP steel for high heat input welding, and its use is a possible strategy for optimizing fabrication times and costs in the shipbuilding industry. 相似文献
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为了进一步研究轧制工艺对厚板管线钢DWTT性能的影响,以X70、X80管线钢为研究对象,在不同板坯加热制度、控制轧制工艺和控制冷却工艺条件下,对厚板管线钢进行了DWTT性能试验,统计分析了轧制工艺参数对DWTT韧性剪切面积SA的影响规律。结果表明,要保证剪切面积SA在85%以上,板坯加热温度为1 150~1 180 ℃,板坯加热时间控制在5~8 h较为合理;在高温变形的粗轧阶段,必须保证在较低的粗轧温度下采用大变形量,单道次变形量大于5%较好;在低温控轧阶段,开轧温度为740~820 ℃,终轧温度为740~780 ℃为较优选择;冷却工艺根据实际情况与控轧工艺相匹配,冷却速度为25~30 ℃/s或45~50 ℃/s,开冷温度为720~800 ℃,终冷温度为450~550 ℃较为合理。 相似文献
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105.
李正嵩 《冶金标准化与质量》2010,(5):39-41
介绍了水钢ER70S-6盘条的试制工艺和产品质量。表明水钢试制的ER70S-6盘条的成分和性能达到标准规定,洁净的钢质和稳定的性能满足了用户要求。 相似文献
106.
A high strength steel with tensile strength on the order of 710MPa had been development successfully with only addition of titanium alloy element based on a low carbon steel. The results show the hot deformation accelerates ferrite and pearlite transformation and retards bainite transformation under continuous cooling condition. The microstructure of this steel is mainly composed of fine-grained ferrite and carbides distributed along the ferrite grain boundaries. The yield and tensile strengths of steels are about 620~650MPa and 720~740MPa, respectively, and the values of strain hardening exponent (n) and plastic strain ratio (r) are 0.12 and 0.80, respectively, thus providing well-matched strength with toughness. In short, the fine-grained ferrite and TiC nano-precipitates play an effective role in strengthening the steel. 相似文献
107.
Effect of Thermomechanical Controlled Processing Parameters on Microstructure and Properties of Q460q Steel 总被引:1,自引:0,他引:1
With tensile test, impact test, and optical microscopy, the effect of thermomechanical controlled process-ing (TMCP) parameters on the microstructure and properties of Q460 steel was studied and analyzed. The TMCP parameters for Q460q steel were optimized by laboratory experiments, and then, industrial trial was carried out. The result indicated that the microstructure and properties of the Q460q steel in industrial trial were in agreement with the results obtained in laboratory experiments and could meet the national standard of Q460q steel. 相似文献
108.
采用TMCP工艺对高强度船体结构钢EH50的研究与开发 总被引:1,自引:0,他引:1
采用TMCP工艺,在实验室对含硼钢和不含硼钢的显微组织和力学性能的变化规律进行了研究。实验结果表明:采用相同的冷却条件,含硼钢的强度明显高于不含硼钢,但伸长率和冲击功低于不含硼钢,且冲击功很不稳定;对于高强度船体结构钢EH50,采用含硼钢,强度和伸长率能达到船级社要求,但冲击功容易出现不合,不含硼钢的强度和韧性能很好地匹配,相对含硼钢具有较低的韧脆性转变温度,建议大生产条件下,采用不含硼钢生产高强度船体结构钢EH50。 相似文献
109.
综述了近10年来国内外细化铁素体晶粒的主要研究成果,提出了一种用于细化铁素体不锈钢晶粒的新方法:微合金化技术(MT)+新型TMCP,为从事铁素体不锈钢晶粒细化研究的工作者提供参考。 相似文献
110.