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通过金相显微镜及力学性能测定,研究了不同热处理工艺对25CrMnB钢力学性能的影响。结果表明,25CrMnB钢随淬火温度提高,晶粒逐渐粗化;随回火温度提高,强度及硬度下降,250～350℃回火时,存在韧塑性恶化区,150～250℃回火时,韧性下降,塑性先升后降,在200℃达最大值。在(880±20)℃淬火+(220±10)℃回火后,履带板具有良好的综合性能,Rm≥1500 MPa、A≥10%,KU2(常温)≥70 J,表面硬度40.0～45.0 HRC,满足了技术条件的要求。
The effects of different heat treatment processes on the mechanical properties of 25CrMnB steel were studied by metallographic microscope and mechanical properties measurement. The results show that as the quenching temperature increases, the grains gradually coarsen. With the increase of tempering temperature, the strength and hardness decrease. When the temperature is raised from 250 ℃ to 350 ℃, the toughness and ductility zone exists. When the temperature is raised from 150 ℃ to 250 ℃, the toughness Decline, the plastic first rose later, reaching the maximum at 200 ℃. After being tempered at (880 ± 20) ℃ and tempered at (220 ± 10) ℃, the track shoe has good overall performance with Rm ≥ 1500 MPa, A ≥ 10%, KU2 (room temperature) ≥ 70 J and surface hardness 40.0 ~ 45.0 HRC, to meet the technical requirements.