Hot Deformation Behavior of Stainless Steel Containing Boron
摘 要
在304不锈钢成分基础上,添加了质量分数1.96%的硼元素,采用真空感应熔炼技术制备含硼不锈钢,对该钢进行单道次热压缩试验,研究了该钢在900~1 150 ℃和应变速率0.1~10 s-1条件下的热变形行为;根据试验数据,基于Arrhenius方程并结合5次多项式拟合建立该钢的热变形本构模型,对加工硬化率-真应力曲线进行分析确定该钢发生动态再结晶的临界条件。结果表明:在试验参数下热压缩后,含硼不锈钢的流变应力-应变曲线为典型的动态再结晶型,软化机制以动态再结晶为主;随着变形温度的升高或应变速率的减小,试验钢的峰值应力及其对应的真应变降低;采用所建立的热变形本构方程计算得到的真应力-真应变曲线与试验测得的相吻合,平均相对误差绝对值为2.76%,说明该本构模型能够准确预测含硼不锈钢的热变形行为;变形温度较高、应变速率较小时,该钢较易发生动态再结晶。
Abstract
The stainless steel containing boron was prepared by vacuum induction melting technique with adding 1.96wt% boron into 304 stainless steel. The hot deformation behavior of the steel was investigated by single pass hot compression tests at 900-1 150 ℃ and strain rate of 0.1-10 s-1. The hot deformation constitutive model of the steel was established by Arrhenius equation with five degree polynomial fitting combined with test data. The critical condition of dynamic recrystallization of the steel was determined by analysis of the work-hardening rate-true stress curves. The results show that the flow stress-strain curves of stainless steel containing boron presented a typical dynamic recrystallization type, and the dominated softening mechanism was dynamic recrystallization after hot compression under the test parameters. With increasing deformation temperature or decreasing strain rate, the peak stress and its corresponding true strain of the test steel decreased. The true stress-true strain curves calculated by the established hot deformation constitutive equation had a good agreement with the test results, and the average absolute relative error was 2.76%, indicating that the constitutive model could precisely predict the hot deformation behavior of stainless steel containing boron. The dynamic recrystallization of the steel occurred easily when the deformation temperature was relatively high and strain rate was relatively small.
中图分类号 TG111.7 DOI 10.11973/jxgccl202104015
所属栏目 物理模拟与数值模拟
基金项目
收稿日期 2020/3/31
修改稿日期 2021/1/20
网络出版日期
作者单位点击查看
备注廉晓洁(1968-),男,山西太原人,高级工程师,学士
引用该论文: LIAN Xiaojie. Hot Deformation Behavior of Stainless Steel Containing Boron[J]. Materials for mechancial engineering, 2021, 45(4): 81~87
廉晓洁. 含硼不锈钢的热变形行为[J]. 机械工程材料, 2021, 45(4): 81~87
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【7】裴宇, 宋仁伯, 贾翼速,等. 退火工艺对304B奥氏体不锈钢钢丝组织性能的影响[J]. 武汉科技大学学报,2013,36(1):26-31. PEI Y, SONG R B, JIA Y S, et al. Effects of annealing process on structure and properties of 304B austenitic strainless steel wire[J]. Journal of Wuhan University of Science and Technology, 2013,36(1):26-31.
【8】徐梅, 米振莉, 李辉, 等. 基于位错密度理论的超高强双相钢DP1000热变形本构模型[J]. 材料研究学报, 2017, 31(8):576-584. XU M, MI Z L, LI H, et al. Constitutive model based on dislocation density theory for hot deformation behavior of ultra-high strength dual phase steel DP1000[J]. Chinese Journal of Materials Research, 2017, 31(8):576-584.
【9】WEN D X, LIN Y C, LI H B, et al. Hot deformation behavior and processing map of a typical Ni-based superalloy[J]. Materials Science & Engineering:A, 2014, 591(2):183-192.
【10】BERGSTRÖM Y. A dislocation model for the stress-strain behaviour of polycrystalline α-Fe with special emphasis on the variation of the densities of mobile and immobile dislocations[J]. Materials Science and Engineering, 1970, 5(4):193-200.
【11】SELLARS C M, TEGART W J. Hotworkability[J]. International Metallurgieal Reviews, 1972, 17:1-24.
【12】JONAS J J, SELLARS C M T. Strength and structure under hot-working conditions[J]. Metallurgical Reviews, 1969, 14(1):1-24.
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【14】林高用, 张辉, 郭武超, 等. 7075铝合金热压缩变形流变应力[J]. 中国有色金属学报, 2001, 11(3):412-415. LIN G Y, ZHANG H, GUO W C, et al. Flow stress of 7075 aluminum alloy during hot compression deformation[J]. The Chinese Journal of Nonferrous Metals, 2001, 11(3):412-415.
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