高Co-Ni二次硬化钢的设计准则与时效工艺分析

发布时间：2018-03-22 13:10

本文选题：奥氏体层　切入点：MC析出相　出处：《金属学报》2017年02期 　论文类型：期刊论文

【摘要】：通过对已有高Co-Ni二次硬化钢实验结果的分析,提出了基于纳米级奥氏体层的相变诱导塑性(TRIP)效应和纳米级M_2C碳化物析出的强韧化机理,并根据Aer Met100钢大量已有的实验数据,建立了综合考虑奥氏体相变摩尔体积增量、奥氏体层稳定性、奥氏体层厚度、奥氏体平衡含量、M_2C尺寸、M_2C平衡含量、成本控制等多个因素的设计准则。通过控制时效工艺,将高Co-Ni二次硬化钢中的M_2C相尺寸控制在1~5 nm,奥氏体层厚度控制在10~20 nm。M_2C和奥氏体的平衡含量被分别控制在19.5%和3.8%。根据设计准则分析了新型高Co-Ni二次硬化钢M54的时效工艺制度,模拟设计结果与显微组织实验观察结果基本吻合。设计得到的新型高Co-Ni二次硬化钢具有较好的强度(2021 MPa)和韧性(115 MPa·m1/2)。
[Abstract]:Based on the analysis of the experimental results of high Co-Ni secondary hardening steel, the effect of phase transformation induced plastic tripe (trip) based on nanometer austenitic layer and the strengthening and toughening mechanism of nano-scale M 2C carbide precipitation are proposed. According to a large number of experimental data of Aer Met100 steel, a large number of experimental data are presented. The design criteria are established which include the mole volume increment of austenitic transformation, the stability of austenite layer, the thickness of austenite layer, the balance content of austenite and the M _ 2C / M _ 2C equilibrium content of M _ 2C, and the cost control. The M2C phase size of high Co-Ni secondary hardening steel was controlled at 1 ~ 5 nm, the austenite layer thickness was controlled at 10 ~ 20 nm.M_2C and the equilibrium content of austenite was controlled at 19. 5% and 3. 8% respectively. According to the design criteria, the aging process of new high Co-Ni secondary hardening steel M54 was analyzed. The simulated design results are in good agreement with the experimental results of microstructure. The new high Co-Ni secondary hardening steel has a good strength of 2021 MPA) and toughness of 115 MPa m ~ (1 / 2).
【作者单位】：清华大学材料学院先进材料教育部重点实验室;北京钢铁研究总院;
【基金】：国家自然科学基金项目Nos.51171087和51471094~~
【分类号】：TG142.1

【参考文献】