高温服役3×105h后汽缸螺栓用20Cr1Mo1V1钢的应力松弛性能
Stress Relaxation of 20Cr1Mo1V1 Steel for Cylinder Bolt after Working for 3×105 h at High Temperature
摘 要
利用等强度环法测定了在540 ℃、9.8 MPa下服役3×105 h后汽缸螺栓用20Cr1Mo1V1钢在不同初紧应力下, 540 ℃保温不同时间后的应力松弛曲线, 外推得到了该钢保温1×104, 3×104, 1×105 h松弛后的应力值, 并与标准规定的不漏蒸汽时的最小应力值进行了对比。结果表明: 采用319.51 MPa的初紧力对已服役3×105 h的汽缸螺栓进行紧固可基本保证在一个大修期间内汽缸不漏蒸汽。
应力松弛
汽缸螺栓
等强度环法
20Cr1Mo1V1 steel
stress relaxation
cylinder bolt
equal-strength loop method
Abstract
Stress relaxation curves of 20Cr1Mo1V1 steels for cylinder bolt after working for 3×105 h at 540 ℃ and 9.8 MPa were measured by equal-strength loop method under different initial tighten strains. The stress relaxation values of this steel at 540 ℃ for 1×104, 3×104 , 1×105 h were given through extrapolation method. The results show that cylinder bolts made by 20Cr1Mo1V1 steel after working for 3×105 h were tight enough under the initial pressure of 319.51 MPa to guarantee no-leak in an overhaul period basically.
中图分类号 TG142.7
所属栏目 材料性能及其应用
基金项目
收稿日期 2012/2/26
修改稿日期 2012/10/22
网络出版日期
作者单位点击查看
备注王志武(1963-), 男, 山西怀仁人, 副教授, 博士。
引用该论文: WANG Zhi-wu,SONG Tao. Stress Relaxation of 20Cr1Mo1V1 Steel for Cylinder Bolt after Working for 3×105 h at High Temperature[J]. Materials for mechancial engineering, 2013, 37(2): 74～77
王志武,宋涛. 高温服役3×105h后汽缸螺栓用20Cr1Mo1V1钢的应力松弛性能[J]. 机械工程材料, 2013, 37(2): 74～77
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参考文献
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【3】SINHA N K, SINHA S. Stress relaxation at high temperatures and the role of delayed elasticity[J].Materials Science and Engineering, 2005, 393(1/2): 179-190.
【4】金尧, 戴振羽. 40CrNi2MoV钢应力松弛特性研究[J].核动力工程, 1999, 20(1): 21-24.
【5】JIA G Q, SHEN H W, ZHU Y M. Tensile stress relaxation of turbine bolt steels at high temperature[J].Acta Metallurgica Sinica(English Letters), 2004, 17(4): 542-547.
【6】尹树桐, 龚正春.20CrlMo1V1钢的分级时效工艺研究[J].金属热处理, 2000(8): 20-22.
【7】龚正春, 常铁军.热处理工艺对20Cr1Mo1V1紧固件性能的影响[J].锅炉制造, 1998(4): 38-43.
【8】NETHERCOT D A, SALIH E L, Gardner L. Behaviour and design of stainless steel bolted connections[J].Advances in Structural Engineering, 2011, 14(4): 647-658.
【9】PERRY M, MORRIS P F, CLARKE P D. Optimisation of the long-term service performance of durehete 1055 bolting steel[J].Materials at High Temperatures, 2011, 27(1): 45-52.
【10】EZZAT M A, EL-KARAMANY A S, SAMAAN A A. The dependence of the modulus of elasticity on reference temperature in generalized thermo elasticity with thermal relaxation[J].Applied Mathematics and Computation, 2004, 147(1): 169-189.
【11】张秀凤.预应力钢材杭应力松弛性能的研究与探讨[J].上海钢研, 2005(2): 48-54.
【12】陈汉良.高温螺栓材料应力松弛特性及其许用初始应力计算[J].机械工程材料, 1984, 8(5): 34-39.
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