基于材料计算下淬火配分钢的贝氏体设计

吴萌; 胡智评; 刘仁东; 林春青; 顾兴利; 徐鑫

doi:10.7513/j.issn.1004-7638.2023.05.022

基于材料计算下淬火配分钢的贝氏体设计

doi: 10.7513/j.issn.1004-7638.2023.05.022

吴萌^{1, 2,},
胡智评^{1, 2},
刘仁东^{1, 2},
林春青^{1, 2},
顾兴利^{1, 2},
徐鑫^{1, 2}

1.
海洋装备用金属材料及其应用国家重点实验室, 辽宁鞍山 114009
2.
鞍钢集团钢铁研究院, 辽宁鞍山 114009

基金项目: 辽宁省自然科学基金（基于初始组态调控中锰钢奥氏体稳定化机制研究及奥氏体优化结构设计，2022-MS-450）

详细信息

作者简介:
吴萌，女，1970年出生，天津人，本科，高级工程师，研究方向：汽车钢材料，E-mail：4561236@qq.com

中图分类号: TF76
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- 文章访问数: 51
- HTML全文浏览量: 25
- PDF下载量: 10
- 被引次数: 0
出版历程
- 收稿日期: 2022-12-06
- 网络出版日期: 2023-11-04
- 刊出日期: 2023-10-31

Bainite design in quenching and partitioning steel based on numerical calculation

Wu Meng^{1, 2
,},
Hu Zhiping^{1, 2},
Liu Rendong^{1, 2},
Lin Chunqing^{1, 2},
Gu Xingli^{1, 2},
Xu Xin^{1, 2}

1.
State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, Liaoning, China
2.
Ansteel Iron & Steel Research Institutes, Anshan 114009, Liaoning, China

摘要

摘要: 将材料热、动力学与中试试验相结合，针对商用淬火配分（Q&P，Quenching and Partitioning）钢的贝氏体进行优化设计。基于试验膨胀数据建立Bohemen切变模型，充分考虑淬火配分工艺下过时效等温阶段的组织演变复杂性，特别是回火阶段马氏体中碳化物析出特性以及对膨胀结果的影响，通过合理化数据对Bohemen模型进行修订，建立等温贝氏体相变动力学模型，实现贝氏体相变的精准预测。结合修订的Bohemen模型计算结果分析淬火配分钢中贝氏体/马氏体交互作用对残余奥氏体保留及稳定性的影响。结果显示，低淬火温度下马氏体板条间的残余奥氏体含量高，占据变形过程中的主导地位；反之，高淬火温度下贝氏体中的残余奥氏体含量高。由此形成基于材料计算下淬火配分钢的贝氏体优化设计。
- 材料计算 /
- Boheman切变模型 /
- 贝氏体/马氏体交互作用 /
- 残余奥氏体 /
- 贝氏体优化设计
Abstract: In this study, an optimum design of bainite phase in the commercial quenching and partitioning (Q&P) steel was achieved through the combined results from thermodynamics, kinetics analysis and the pilot experiments. Considering the complex microstructure evolution during partitioning stage of the Q&P treatment, especially the precipitation characteristics of carbides in martensite and their influence on the expansion result, the Boheman model was established and further revised based on the result of expansion experiment. A kinetic model of isothermal bainitic transformation was also set up to simulate this transformation accurately. According to the predicated result from the revised Bohemen model, the effect of the interaction between bainite and martensite on volume fraction and stability of retained austenite was analyzed. The results show that at a low quenching temperature, retained austenite between martensitic laths has a higher volume fraction and plays a dominant role during the deformation. On the contrary, under high temperature quenching condition the volume fraction of retained austenite in bainite is high.
- material calculation /
- Bohemen model /
- interaction between bainite/mar-tensite /
- retained austenite /
- optimum design for bainite

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图 1 不同状态下的贝氏体的膨胀曲线

Figure 1. Dilatometric curves of bainite from different conditions

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图 2 不同淬火温度下残余奥氏体含量分布

Figure 2. Volume fraction of retained austenite in steel under different quenching temperatures

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表 1 试验钢的化学成分

Table 1. Chemical composition of the experimental steel %

C	Mn	Si	Fe
0.20	2.0	1.5	余量

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表 2 XRD的测试参数

Table 2. Parameters of the XRD measurement

电压/ kV	电流/ mA	射线类型	射线波长/nm	扫描步长/（°·min⁻¹）	2θ角扫描范围/(°)
56	182	CuKα	0.154	4	40～120

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表 3 经式（4）拟合所得参数值

Table 3. Fitting parameters for equation (4)

淬火温度/ ℃	f_max/%	κ	λ	拟合R值
50	1.221 62	0.122 81	0	0.322 515 524 347 53
100	2.089 36	0.090 66	0	0.207 776 105 612 78
150	3.861 87	0.049 72	0	0.984 293 070 028 93
175	6.243 20	0.036 52	0	0.954 124 876 733 97
200	11.100 82	0.024 15	0	0.919 254 606 097 86
225	16.299 07	0.019 23	0	0.947 761 646 501 55
250	22.541 96	0.016 23	0	0.964 945 985 838 93
275	28.466 01	0.015 52	0	0.974 133 379 392 81
300	36.432 97	0.011 69	0	0.986 639 580 484 85
350	39.550 00	0.012 64	0	0.986 370 940 368 93
400	43.992 98	0.011 61	0	0.992 992 684 819 78

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