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分析了低合金高强度结构钢S890的成分特点,并通过热模拟试验研究了峰值温度、t8/5等焊接工艺参数对其焊接热影响区性能和组织的影响,同时考察了实际焊接时热输入对其焊接接头性能的影响。结果表明:当焊接热输入由低向高变化时,S890钢的显微组织由回火马氏体转变为铁素体和珠光体,并伴随有奥氏体晶粒的粗化,因此在较低峰值温度或较短t8/5时其焊接热影响区的韧性及硬度要高于较高峰值温度或较长t8/5时的值。而在实际焊接中,热输入在一定范围内的变化对S890钢接头强度的影响不明显,但随着热输入的增加,接头的塑性降低较多。
The compositional characteristics of low alloy high strength structural steel S890 were analyzed. The influence of welding temperature, t8 / 5 and other welding parameters on the performance and microstructure of HAZ was studied by thermal simulation. Meanwhile, Impact on the performance of their welded joints. The results show that when the welding heat input changes from low to high, the microstructure of S890 steel changes from tempered martensite to ferrite and pearlite, accompanied by coarsening of austenite grains. Therefore, The toughness and hardness of HAZ at low peak temperatures or shorter t8 / 5 are higher than those at higher peak temperatures or longer t8 / 5. In actual welding, the change of heat input within a certain range has no obvious effect on the strength of S890 steel joint, but with the increase of heat input, the plasticity of joint decreases more.