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对EH36钢分别进行淬火+空冷、淬火+回火、淬火+回火+亚温淬火+回火的不同热处理。采用金相显微镜、拉伸试验机、冲击试验机及扫描电镜(SEM)测试了试样组织及力学性能。结果表明:原始组织主要为粗大的粒状铁素体以及聚集分布在基体的晶粒之间的珠光体,力学性能最差,同时断口中出现较大的断裂平面,韧窝较少较浅,为脆性断裂的特征;淬火+回火+亚温淬火+回火处理后,钢的铁素体晶粒尺寸发生明显细化,出现由渗碳体与珠光体组成的回火屈氏体,并且珠光体均匀弥散分布在铁索体晶粒之间,组织发生明显改善,力学性能最好,断口中的断裂平面消失,出现大量小而深的断裂韧窝。
EH36 steel were quenched + air-cooled, quenched + tempered, quenched + tempered + sub-tempered quenching + tempering of different heat treatment. The microstructure and mechanical properties of the samples were tested by metallographic microscope, tensile tester, impact tester and scanning electron microscope (SEM). The results show that the primary structure is coarse granular ferrite and pearlite aggregated distributed between the grains of the matrix, which has the worst mechanical properties. At the same time, the fracture plane is larger and the dimples are less and shallower Brittle fracture characteristics; quenching + tempering + sub-temperature quenching + tempering, the ferrite grain size of steel significantly refined, there by the cementite and pearlite tempering troostite body, and pearl The bodies are distributed uniformly between the ferrite bulk grains, the microstructure is obviously improved, the mechanical properties are the best, the fracture plane in the fracture disappears, and a large number of small and deep fracture dimples appear.