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在高强度舰船船体结构钢(Ni-Cr-Mo钢)980基础上,通过降碳、优化合金元素等方法,采用纳米微钛处理方法,从参考钢A制备出新型纳米增强Ni-Cr-Mo钢B。对钢A和钢B进行轧制-调质处理后,在t8/5=80 s条件下进行焊接热循环试验。研究了纳米析出相对模拟焊接热影响区组织的影响。结果表明,钢B在凝固过程和焊接热循环过程中产生大量小尺寸、热稳定性高的析出相粒子,这些析出相有效阻碍了奥氏体晶粒在焊接热循环升温过程中的长大,细化了模拟焊接热影响区的奥氏体晶粒。
Based on Ni-Cr-Mo steel 980, a new type of nano-reinforced Ni-Cr-Mo alloy was prepared from reference steel A by means of reduction of carbon and optimization of alloying elements, Mo Steel B. After the steel A and steel B were rolled-quenched and tempered, the welding thermal cycle test was carried out under the condition of t8 / 5 = 80 s. The effect of nano-precipitation on the microstructure of the HAZ was simulated. The results show that a large amount of precipitated particles with small size and high thermal stability are produced in the solidification process and the welding thermal cycle. These precipitates effectively hinder the growth of austenite grains during the welding thermal cycle, Refine the simulated heat affected zone of austenite grains.