Abstract
In order to study the influence mechanism of HSLA weld metal with different composition on high‐temperature strength, four kinds of HSLA weld metal are designed by using low‐carbon Si–Mn and Si–Mn–Ni alloy system. Different samples are prepared by simple process of normalizing and high‐temperature tempering. The experimental results show that the weld metal is mainly composed of polygonal ferrite, quasipolygonal ferrite, pearlite, and granular bainite. Ni can change the microstructure shape of reheating zone and inhibit the formation of granular bainite. When the tempering temperature is lower than 580 °C, the strength increases. After tempering at 580 °C, the tensile strength and yield strength reach the peak value. When the tempering temperature exceeds 580 °C, the strength begins to decrease. The microhardness of the two alloy systems decreases gradually from columnar crystal zone to recrystallization zone. The impact absorption energy of the four samples is greater than 200 J at 600 °C. Under different temperature conditions, the content of Ni in all second‐phase particles is less than 10%, the content of Mn is lower, and the content of Si is higher.
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