
第42卷第6期 Vol. 42No. 6
理论与实验研究
钣压技术
FORGING & STAMPING TECHNOLOGY
S34MnV钢的高温压缩变形行为实验
褚亮1,2,谢谈,钟志平,崔怀旭
(1.北京机电研究所,北京10083:2.天津理工大学材料科学与工程学院,天津300384
3.天津市康库得机电技术有限公司,天津300011)
2017年6月 Jun2017
摘要:针对大型船用曲轴曲拐所用材料S34MnV合金钢,利用Gleeble-3800热模拟实验机对其进行高温压缩实验,研究了 S34MnV合金钢在变形温度为950-1250℃、应变速率为0.001-10s-"和压缩变形量为70%条件下的高温变形行为,得到了其真实应力-应变曲线。分析了变形湿度、应变速率对S34MnV合金钢高温流变行为的影响。结果表明,变形温度和应变速率对流动应力影响显著,流动应力随变形温度升高而下降,随应变速率增大而上升;低的应变速率、高的变形温度,更易于动态再结品的发生,有利于降低流动应力。
关键词:S34MnV钢:高温压缩;流变行为;动态再结晶;流动应力 DOI: 10. 13330/j. issn. 1000-3940. 2017. 06, 029
中图分类号:TG113
文献标识码:A
文章编号:1000-3940(2017)06-0155-04
ExperimentonhotcompressionbehaviorsofS34Mnalloysteel
Chu Liang'-2, Xie Tan', Zhong Zhiping', Cui Huaixu?
(1. Beijing Research Institute of Mechanical and Electrical Technology , Beijing 100083, China ;:
2. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China :
3. Tianjin Concord Mechanical and Electrical Technology Co. , Lid. , Tianjin 300011, China)
Abstract: For alloy steel S34MnV used in the manufacture of large marine crankshaff, the hot compression experiment was carried out by the Gleeble 3800 thermal simulation test machine_ Then, deformation behaviors of alloy steel S34MnV were researched at 950 ~ 1250 °C , strain rate of 0. 001 10 s-' and compression deformation of 70% , and the true stress-true strain curves were gained. In addition, the influences of deformation temperature and strain rate on rheological behavior of alloy steel S34MnV were analyzed. The results show that deformation temperature and strain rate have significant influences on the flow stress. The flow stress decreases with the rising of de-formation temperature and increases with the increasing of strain rate. When the strain rate is lower and deformation temperature becomes higher, the dynamic recrystallization occurs easily and is helpful to reduce the flow stress.
Key words : S34MnV alloy steel; hot compression; rheological behavior; dynamic recrystallization; flow stress
曲轴是柴油机的关键部件[1-2],工作受力情况极其复杂,负荷大[3-4]。大型船用曲轴锻造用钢要求具有高的抗拉强度、疲劳强度和良好的耐磨性,心部需有一定的韧性[5]。S34MnV钢是MANB&W 公司大型船用曲轴锻造的专用钢,元素Mn起到强化铁素体和细化珠光体的作用,使钢的强度得到提
收稿日期:20170401;修订日期:20170515
基金项目:“高档数控机床与基础制造装备”科技重大专项(2013ZX04003 031)
作者简介:褚亮(1979-),男,博士研究生 E-mail: chuliangszhm@ 163. com
通讯作者:谢谈(1953-)男,学士,研究员 E-mail: xietan@ jds. ac. en
万方数据
高[",加人微量元素V用以改善钢的韧性[5]
目前,对S34MnV钢的研究主要集中于其组织细化、夹杂物控制热处理工艺和生产工艺改进等方面[5-9],而对其力学行为特点,特别是高温力学行为的相关研究还很少,有必要对S34MnV钢的热变形行为进行研究。基于此,本文通过对S34MnV钢进行热模拟压缩实验,得到了S34MnV钢高温流动应力曲线,分析了变形温度、应变速率对S34MnV 钢高温流变行为的影响,旨在为大型船用曲轴成形工艺的改进提供依据。
1实验方案 1.1实验材料
大型船用曲轴曲拐所用材料S34MnV钢的主要