SA508Gr.4N钢热变形过程微观组织演变及流变应力模型

doi:10.11868/j.issn.1001-4381.2020.000566

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摘要

利用Gleeble-1500D热模拟试验机研究Ni-Cr-Mo系低合金SA508Gr.4N钢在变形温度为850~1200℃，应变速率为0.001~1 s^-1，真应变为0.9条件下的等温热变形行为，建立包含动态回复和动态再结晶的基于物象的流变应力模型与动态再结晶晶粒尺寸模型，并提出避免粗大晶粒组织遗传性的适宜锻造工艺。结果表明：随着变形温度的升高，应变速率的降低，动态再结晶体积分数和晶粒尺寸逐渐增加；SA508Gr.4N钢的真应力-真应变曲线具有明显的不连续动态再结晶现象；通过实验值和模型预测值对比可得流变应力模型的相关系数(R)及平均相对误差(MRE)分别为0.998和4.76%，动态再结晶晶粒尺寸模型的相关系数(R)及平均相对误差(MRE)分别为0.991和8.69%，两个模型均具有较高的准确性。

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	乔士宾
	何西扣
	刘敬杰
	赵德利
	刘正东

关键词 ： SA508Gr.4N钢, 热变形, 动态再结晶, 流变应力, 晶粒尺寸

Abstract：

The isothermal deformation behavior of Ni-Cr-Mo low alloy SA508Gr.4N steel at deformation temperature of 850-1200 ℃, strain rate of 0.001-1 s^-1, and true strain of 0.9 was studied by using Gleeble-1500D thermal simulation testing machine.The physically based flow stress model including dynamic recovery and dynamic recrystallization and the dynamic recrystallization grain size model were established, and the suitable forging process to avoid the coarse grain structure heredities was put forward.The results show that as the deformation temperature increases and the strain rate decreases, the dynamic recrystallization volume fraction and grain size gradually increase; the true stress-true strain curve of SA508Gr.4N steel has an obvious discontinuous dynamic recrystallization phenomenon; by comparing the experimental value with the predicted value of the model, the correlation coefficient (R) and mean relative error (MRE) of the flow stress model are 0.998 and 4.76%, respectively, and the correlation coefficient (R) and mean relative error (MRE) of the dynamic recrystallization grain size model are 0.991 and 8.69%, respectively. The two models have high accuracy.

Key words： SA508Gr.4N steel hot deformation dynamic recrystallization flow stress grain size

收稿日期: 2020-06-23 出版日期: 2021-03-20

中图分类号:

TG142

基金资助:国家科技重大专项(2010ZX06004-016)

通讯作者: 何西扣 E-mail: He_Xikou@163.com

作者简介: 何西扣(1985-), 男, 高级工程师, 博士, 研究方向为能源动力系统用耐热钢及合金, 联系地址: 北京市海淀区学院南路76号钢铁研究总院特殊钢研究所(100081), E-mail: He_Xikou@163.com

引用本文:

乔士宾, 何西扣, 刘敬杰, 赵德利, 刘正东. SA508Gr.4N钢热变形过程微观组织演变及流变应力模型[J]. 材料工程, 2021, 49(3): 67-77.
Shi-bin QIAO, Xi-kou HE, Jing-jie LIU, De-li ZHAO, Zheng-dong LIU. Microstructure evolution and flow stress modeling of SA508Gr.4N steel during hot deformation process. Journal of Materials Engineering, 2021, 49(3): 67-77.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000566 或 http://jme.biam.ac.cn/CN/Y2021/V49/I3/67

Table 1 SA508Gr.4N钢成分(质量分数/%)

Fig.1 热压缩变形工艺图

Fig.2 不同变形条件下SA508Gr.4N钢的真应力-真应变曲线
(a)0.001 s^-1; (b)0.01 s^-1; (c)0.1 s^-1; (d)1 s^-1

Fig.3 真应变为0.9时不同变形条件下SA508Gr.4N钢的晶粒微观组织
(a)850 ℃, 1 s^-1; (b)950 ℃, 1 s^-1; (c)1050 ℃, 1 s^-1; (d)1150 ℃, 1 s^-1; (e)1200 ℃, 1 s^-1; (f)1200 ℃, 0.1 s^-1; (g)1200 ℃, 0.01 s^-1; (h)1200 ℃, 0.001 s^-1

Table 2 不同变形工艺下动态再结晶晶粒尺寸(μm)

Fig.4 不同热变形参数下SA508Gr.4N钢的加工硬化曲线
(a)0.001 s^-1; (b)0.01 s^-1; (c)0.1 s^-1; (d)1 s^-1

Fig.5 峰值应力、变形温度和应变速率之间的关系
(a)ln

-lnσ_p; (b)ln

-σ_p; (c)ln

-ln [sinh (ασ_p)]; (d)ln [sinh (ασ_p)]-1000/T

Fig.6 特征值与lnZ的关系
(a)lnε_c-lnZ; (b)ln[sinh(ασ_sat)]-lnZ; (c)ln[sinh(ασ_ss)]-lnZ; (d)lnσ₀-lnZ; (e)lnK-lnZ

Table 3 不同变形条件下动态再结晶体积分数为50%时对应的真应变

Fig.7 lnε_0.5与ln和1000T^-1之间的关系
(a)lnε_0.5-ln

; (b)lnε_0.5-1000T^-1

Fig.8 ln{ln[1/(1-X_DRX)]}和ln[(ε-ε_c)/ε_0.5]之间的关系

Fig.9 晶粒尺寸与应变速率和变形温度的线性拟合关系
(a)lnD_DRX-ln

; (b)lnD_DRX-1000T^-1

Fig.10 不同应变速率下变形温度为850~1200 ℃时的流变应力预测值与实验值对比
(a)0.001 s^-1; (b)0.01 s^-1; (c)0.1 s^-1; (d)1 s^-1

Fig.11 不同变形条件下动态再结晶晶粒尺寸预测值与实验值对比

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