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本文研究了临界点间热处理对30CrMnSi钢的组织和机械性能的影响。结果表明:钢经临界点间热处理后的机械性能(如σ_b,σ_(0.2),δ,ψ和a_k)达到了国家标准。其中a_k为国家标准的3倍。值得注意的是钢经临界点一次淬火和低温回火后,其强度(σ_b,σ_(0.2))达到超高强度钢的水平。即σ_b≥170kg/mm~2,σ_(0.2)≥150kg/mm~2。此外,这种工艺比较简单,加热温度低,可节省能源。还可减小钢中淬火应力、扭曲及开裂倾向。
In this paper, the effect of critical heat treatment on the microstructure and mechanical properties of 30CrMnSi steel was studied. The results show that the mechanical properties (such as σ_b, σ_ (0.2), δ, ψ and a_k) reached the national standard after the heat treatment between the critical points. Which a_k 3 times the national standard. It is worth noting that the strength (σ_b, σ_ (0.2)) reaches the level of ultra-high strength steel after quenching and tempering at the critical point. Σ_b ≥ 170kg / mm ~ 2, σ_ (0.2) ≥ 150kg / mm ~ 2. In addition, this process is relatively simple, low heating temperature, can save energy. Can also reduce the steel quenching stress, distortion and cracking tendency.