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对30Si2MnCrMo贝氏体高强钢进行了220～320℃等温处理，分析了贝氏体/马氏体(B/M)体积比与M/A岛核壳协同结构对其力学性能的调控机制。采用膨胀法-纳米压痕联合相区测定方法，定量地表征了30Si2MnCrMo钢中B/M的比例及对其性能的贡献。结果表明：随着等温温度的升高，30Si2MnCrMo钢中的贝氏体含量逐渐增加，马氏体和残留奥氏体含量逐渐降低，硬度和贝氏体板条尺寸先增加后减少，冲击吸收能量逐渐增加；当等温温度为260℃,30Si2MnCrMo钢达到了最佳的强韧性匹配，其B/M比接近1∶1(贝氏体含量为50.3%,马氏体含量为46.6%),贝氏体板条细化至134 nm,硬度达到峰值45.3 HRC,M/A岛包壳结构(其中马氏体核心的纳米硬度为7.04 GPa)与大角度晶界的协同作用显著提高了30Si2MnCrMo钢的韧性，冲击吸收能量提升至77 J。
Abstract：30Si2MnCrMo bainitic high-strength steel was isothermal treated at 220 ℃-320 ℃, and the regulation mechanism of bainite/martensite(B/M) volume ratio and M/A island core-shell synergistic structure on its mechanical properties was analyzed. The proportion of B/M in the 30Si2MnCrMo steel and its contribution to properties were quantitatively characterized by the combined dilatometry-nanoindentation phase characterization method. The results show that with the increase of isothermal treatment temperature, the bainite content in the 30Si2MnCrMo steel gradually increases, the martensite and retained austenite content gradually decreases, the hardness and bainite lath size first increase and then decrease, and the impact absorbed energy gradually increases. When the isothermal treatment temperature is 260 ℃, the 30Si2MnCrMo steel achieves the best strength and toughness matching, its B/M ratio is close to 1∶ 1(with bainite content of 50.3% and martensite content of 46.6%), the bainite lath is refined to 134 nm, and the hardness reaches the peak value of 45.3 HRC. The synergistic effect of M/A island core-shell structure(the nanohardness of martensite core is 7.04 GPa) and large-angle grain boundary significantly improves the toughness of the 30Si2MnCrMo steel, and the impact absorbed energy increases to 77 J.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2025-0115
中图分类号:TG142.1
引用信息:
[1]赵阳悦,熊伟,高俊峰,等.30Si2MnCrMo钢贝/马相与M/A岛协同调控强韧化机制[J].材料热处理学报,2026,47(03):173-181.DOI:10.13289/j.issn.1009-6264.2025-0115.
基金信息:
中央引导地方科技发展资金项目(2024ZY0071); 鄂尔多斯市重点研发计划(YF20232333)
2026-03-19
2026-03-19