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通过焊接热循环模拟试验,对试样进行微观组织结构观察和低温韧性测试,研究了不同条件的热循环过程对一种低合金高强度船体钢组织及性能的影响。结果表明:在一定的焊接线能量范围内,t8/5对试验钢的组织及性能影响不大,模拟粗晶区组织主要为马氏体和贝氏体;峰值温度对试验钢热影响区组织及低温韧性影响较大,粗晶区为热影响区薄弱环节,二次热循环可提高试验钢粗晶区的低温韧性;试验钢经历两次粗晶区热循环后仍保持有细小的板条结构及条间奥氏体,冲击韧性较为稳定。
Through the welding thermal cycle simulation test, the microstructure of the sample was observed and the low temperature toughness test was carried out to study the influence of the thermal cycling under different conditions on the microstructure and properties of a low alloy high strength hull steel. The results show that within a certain range of welding wire energy, t8 / 5 has little effect on the microstructure and properties of the test steel. The simulated coarse grain zone mainly consists of martensite and bainite. The peak temperature affects the microstructure of the HAZ And the toughness of low temperature have a greater impact. The coarse grain zone is the weak link in the heat affected zone. The second heat cycle can improve the low temperature toughness of the coarse grain zone of the test steel. The test steel maintains fine laths after twice the thermal cycle of the coarse grain zone Austenite structure and the bar, the impact toughness is more stable.