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对300M钢圆棒进行真空气淬试验,并对其淬透性、显微组织及力学性能进行了测试与分析。在10 bar N2真空高压气淬条件下,能淬透60 mm的300M钢圆棒,气淬后抗拉强度达到2000 MPa,屈服强度1700 MPa,塑韧性指标能达到油淬性能,气淬后的显微组织为均匀的板条马氏体。
The vacuum gas quenching test was carried out on 300M steel round rod, and its hardenability, microstructure and mechanical properties were tested and analyzed. Under the conditions of 10 bar N2 vacuum high-pressure gas quenching, the M60 mm 300M steel round rod can be hardened. After gas quenching, the tensile strength reaches 2000 MPa and the yield strength reaches 1700 MPa. The plastic toughness index can achieve the oil quenching performance. The microstructure is uniform lath martensite.