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研究了两种低合金高强度工程机械用钢——ＨＧ５０和ＣＦ６０的母材和焊接接头（包括焊缝和焊接热影响区）在三种压头位移速率下的断裂韧性随着温度的变化行为，分析了加载速率和焊接工艺对于其断裂韧性的影响。结果表明：ＨＧ５０和ＣＦ６０钢的断裂韧性尽管对于加载速率很敏感，仍然具有较好的动态断裂韧性，适于用做承受冲击的工程机械的受力构件；焊接过程可造成韧—脆转变温度的升高，加大了韧—脆转变曲线过渡区的温度范围，并使得过渡区内的断裂韧性数据具有较大的发散性。
The fracture toughness of the two kinds of low alloy and high strength engineering machinery steel -HG50 and CF60 base metals and welded joints (including weld and HAZ) under three kinds of indenter displacement rates were studied with the change of temperature The effects of loading rate and welding process on fracture toughness were analyzed. The results show that the fracture toughness of HG50 and CF60 steels, though sensitive to the loading rate, still have good dynamic fracture toughness and are suitable for the mechanical components of the construction machinery subjected to impact. The welding process can result in a ductile-brittle transition temperature Increase the temperature range of the ductile-brittle transition curve transition zone, and make the fracture toughness data in the transition zone have greater divergence.