求翻译：对Q345R低合金钢而言，快速冷却产生以板形马氏体和粒状贝氏体为主的硬相组织，提高材料的强度，但塑性较差；缓慢冷却能降低金属板内的残余应力，提高其塑性；回火会降低内应力，提高塑性，使组织更加均匀、稳定是什么意思？

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The Q345R low alloy steel, with rapid cooling plate-shaped maraging steel and granular bainite primary hard-organization, improve the strength of the material, but the plastic is poor; slow cooling to reduce the residual metal strain relief and increase its plastic; tempered will reduce internal str

Speaking of the Q345R low-alloy structural steel, fast cooling produces by the shape of strip martensite and the granular bainite primarily hard organizes, to enhance the material the intensity, but the plasticity is bad; Slow cooling can reduce in the metal plate the residual stress, enhances its p

Q345R low alloy steel, rapid cooling to form martensite and granular Bainite hard structure, increase the strength, but low plasticity; slow cooling can reduce the sheet metal of the residual stress, improve ductility; tempering can reduce stress, improve plasticity, makes the Organization more even

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