0Cr16Ni5Mo低碳马氏体不锈钢的热变形行为及其热加工图

doi:10.11868/j.issn.1001-4381.2016.05.002

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摘要

在Gleeble-3800 热模拟试验机上进行高温压缩实验, 研究 0Cr16Ni5Mo低碳马氏体不锈钢在变形温度为900~1150℃、应变速率为0.01~10s^-1条件下的热变形行为。采用双曲正弦模型确定了该材料的热变形参数随应变量的变化规律,建立了相应的热变形本构方程。根据动态材料模型建立并分析了其热加工图,同时观察了变形组织。结果表明:在热压缩过程中, 流变应力随变形温度的升高而降低,随应变速率的升高而增加,变形条件对材料的组织结构有较大影响。材料热变形参数与应变量之间可采用四次函数关系式表示,并且具有很好的相关性,获得了该材料的最佳热变形工艺参数范围为:变形温度980~1150℃,应变速率0.01~0.2s^-1。

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	袁武华
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关键词 ： 0Cr16Ni5Mo马氏体不锈钢, 流变应力, 本构模型, 动态再结晶, 热加工图

Abstract：

The hot deformation behavior of 0Cr16Ni5Mo low carbon martensitic stainless steel was studied by the isothermal compression of cylindrical specimens at 900-1150℃ with the strain rate of 0.01-10s^-1 on a Gleeble-3800 simulated machine. The relations of the thermomechanical parameters with strain were obtained using the hyperbolic-sine mathematics model and the hot deformation constitutive relationship was established. Processing map was also established based on the dynamic materials model. The microstructure evolution at different conditions was analyzed. The results show that the flow stress decreases with the increase of deformation temperature and increases with the increase of strain rate, the deformation condition has a great influence on the material microstructure. The relationship between deformation parameters and strain have a good relativity, which can be expressed using four polynomial fitting. An optimum processing parameters of hot deformation for this steel can also be obtained by the maps, in which the hot temperature is 980-1150℃ and the strain rate is 0.01-0.2s^-1.

Key words： 0Cr16Ni5Mo martensitic stainless steel flow stress constitutive model dynamic recrystallization processing map

收稿日期: 2014-09-16 出版日期: 2016-05-19

中图分类号:

TG142.71

通讯作者: 袁武华 E-mail: yuan46302@163.com

作者简介: 袁武华(1973-),男,教授,博士,主要从事金属与金属基复合材料相关方面研究,联系地址:湖南省长沙市岳麓区湖南大学材料科学与工程学院(410082),E-mail:yuan46302@163.com

引用本文:

袁武华, 龚雪辉, 孙永庆, 梁剑雄. 0Cr16Ni5Mo低碳马氏体不锈钢的热变形行为及其热加工图[J]. 材料工程, 2016, 44(5): 8-14.
Wu-hua YUAN, Xue-hui GONG, Yong-qing SUN, Jian-xiong LIANG. Hot Deformation Behavior and Processing Map of 0Cr16Ni5Mo Low Carbon Martensitic Stainless Steel. Journal of Materials Engineering, 2016, 44(5): 8-14.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.05.002 或 http://jme.biam.ac.cn/CN/Y2016/V44/I5/8

Fig.1 试样固溶热处理后显微组织

Fig.2 0Cr16Ni5Mo马氏体不锈钢应力-应变曲线 (a)=0.01s^-1;(b)=0.1s^-1;(c)=1s^-1;(d)=10s^-1

Fig.3 0Cr16Ni5Mo不锈钢峰值应力与变形速率 (a)和变形温度 (b)的关系(ε=0.4)

Fig.4 0Cr16Ni5Mo不锈钢峰值应力与Z参数的关系(ε=0.4)

Fig.5 0Cr16Ni5Mo不锈钢材料参数与应变量之间的变化关系 (a)α-ε;(b)n-ε;(c)Q-ε;(d)lnA-ε

Fig.6 0Cr16Ni5Mo不锈钢的热加工图 (a)ε=0.6；(b)ε=0.8

Fig.7 不同变形条件下0Cr16Ni5Mo不锈钢的典型热变形组织 (a)T=900℃,=0.01s^-1;(b) T=900℃,=10s^-1;(c) T=950℃,=0.1s^-1;(d)T=1100℃,=0.1s^-1;(e)T=1100℃,=1s^-1;(f)T=1150℃,=0.01s^-1

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