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设计了一种低碳Mn-Mo-Nb-Cu-B系超高强度工程机械结构用钢,研究了在同种成分条件下TMCP(thermo-mechan-ical control-process)+回火与控轧+直接淬火+回火两种工艺对钢组织和性能的影响.对比分析了热处理前后钢板各项力学性能和组织的变化.结果表明,两种工艺条件下钢的屈服强度和冲击性能的变化趋势相似,经500～620℃回火1h后钢的屈服强度均有大幅度提高.控轧+直接淬火+回火得到的钢板综合性能明显优于TMCP+回火,前者在600℃回火后屈服强度仍达到1000MPa以上,同时延伸率达到18%,-40℃冲击功大于30J,而后者塑性较好但强度稍低;随回火温度的升高,控轧+直接淬火+回火工艺条件下的组织演化速度要快于TMCP+回火工艺.
A kind of low-carbon Mn-Mo-Nb-Cu-B super high-strength engineering mechanical structural steel was designed and studied under the same composition conditions TMCP (thermo-mechano-mechanical control-process) + tempering and controlled rolling + Direct quenching + tempering on the microstructure and properties of the steel.The mechanical properties and microstructures of the steel before and after heat treatment were comparatively analyzed.The results show that the yield strength and impact properties of the steel under both conditions , The yield strength of steel after tempering at 500-620 ℃ for 1h increased significantly.The comprehensive properties of the steel obtained by controlled rolling + direct quenching + tempering were significantly better than that of TMCP + tempering, the former after tempering at 600 ℃ yield strength Still reach 1000MPa above, while the elongation rate reached 18%, - 40 ℃ impact power is greater than 30J, while the latter plastic better but lower strength; with the tempering temperature, controlled + direct quenching + tempering process conditions Tissue evolution faster than the TMCP + tempering process.