限制淬透性GCr4轴承钢的组织和性能

Structure and Properties of Restricted Hardenability GCr4 Bearing Steel

试验研究了成分为:1.00%C、0.40%Cr、0.03%Mo、0.034%Al、10×10^(-6)[O]的GCr4轴承钢经感应穿透加热-表面淬火(840±10)℃+回火150～160℃后的组织和性能。结果表明,热处理后GCr4钢表面层由孪晶马氏体和位错马氏体组成,心部组织为屈氏体+索氏体。GCr4钢的淬透性(J60,3.0 mm)明显低于GCr15钢(1.01%C、1.52%Cr、11×10^(-6)[O])的淬透性(J60,4.5 mm);其感应加热淬火+回火的冲击韧性和断裂韧性K_(IC)分别比(840±10)℃淬火+(150～160)℃回火的GCr15钢提高66%～104%和67%。GCr4钢接触疲劳寿命较GCr15钢提高12%～26%。

The structure and properties of GCr4 bearing steel - 1.00% C, 0.40% Cr, 0. 03% Mo, 0. 034% Al, 10 × 10^-6[ O ] heat treated by cross section induction heating and quenching （840 ± 10 ）℃ ＋ tempering （ 150 - 160 ℃ ） have been tested and researched. Results showed that after heat treated the case structure of GCr4 steel consisted of twinned martensite and dislocation martensite, and the core structure was troostite ＋ sorbite. The hardenability of GCr4 steel （J60, 3. 0 mm） was markedly lower than that of GCrl5 bearing steel - 1.01% C, 1.52% Cr, 11 ×10^-6 [ O] （J60, 4. 5 mm） , the impact toughness and fracture toughness KIC of GCr4 steel increased respectively by 66% - 104% and 67% as compared with that of steel GCrl5 heat treated by （840 ± 10） ℃ quenching ＋ （ 150 ± 160） ℃ tempering, and the contact fatigue life of steel GCr4 increased by 12% - 26% as compared with that of steel GCr15.