Surface Residual Stress Distribution of 6.8 Grade Cold Heading Bolts
摘 要
利用X射线衍射残余应力分析仪测定了6.8级螺栓热处理前后表层轴向和切向残余应力及其分布, 分析了冷镦和缩径对螺杆与螺栓头部过渡圆角处残余应力的影响。结果表明:热处理前螺栓表层残余应力分布不均匀, 最大残余拉应力为155.8 MPa, 热处理后残余应力降低幅度可达50%; 半径方向上, 残余应力随深度的增加由压应力向着拉应力转变。
Abstract
The axial and tangential surface residual stress and its distribution of 6.8 grade bolts before and after heat treatment were measured by X-ray residual stress tester, and the effects of cold heading and necking down on the residual stress of screw and bolt head transition fillet were analyzed. The results show that the distribution of surface residual stress of the bolts before heat treatment was nonuniform, the maximum residual tensile stress was 155.8 MPa, and the amplitude of decline was up to 50% after heat treatment. In the radius direction, with the increase of the depth, the residual stress changed from compress stress to tensile stress.
中图分类号 TG115.2 DOI 10.11973/lhjy-wl201602006
所属栏目 试验与研究
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收稿日期 2015/7/7
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备注蔡联瑜(1990-),男,硕士研究生。
引用该论文: CAI Lian-yu,KONG Gang,WENG Tian-yu,JIANG Ai-hua,QI Kai,WANG Xin-hua. Surface Residual Stress Distribution of 6.8 Grade Cold Heading Bolts[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2016, 52(2): 99~103
蔡联瑜,孔纲,翁天宇,江爱华,齐凯,王新华. 6.8级冷镦螺栓的表层残余应力分布[J]. 理化检验-物理分册, 2016, 52(2): 99~103
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参考文献
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【2】RUIZ-HERVIAS J, LUZIN V, PRASK H, et al. Effect of thermo-mechanical treatments on residual stresses measured by neutron diffraction in cold-drawn steel rods[J].Materials Science and Engineering A,2006,435/436: 725-735.
【3】DENG D, MURAKAWA H. Numerical simulation of temperature field and residual stress in multi-pass welds in stainless steel pipe and comparison with experimental measurements[J].Computational Materials Science,2006,37(3): 269-277.
【4】陆业航,张杰,吴冰,等.铸造TC4钛合金电子束焊残余应力测试[J].理化检验-物理分册,2013,49(11): 711-713.
【5】周磊,赵秀娟,陈春焕,等.热处理工艺对GCr15钢轴承外环淬火组织和性能的影响[J].理化检验-物理分册,2013,49(10): 650-653.
【6】GB/T 3098.1-2010 紧固件机械性能 螺栓、 螺钉和螺柱[S].
【7】ASTM A394-2008 钢制镀锌输变电铁塔螺栓和螺母规格[S].
【8】DIN 7990-2008 钢结构用带六角螺母的六角头螺栓[S].
【9】DL/T 284-2012 输电线路杆塔及电力金具用热浸镀锌螺栓与螺母[S].
【10】SATO S, WAGATSUMA K, SUZUIKI S, et al. Relationship between dislocations and residual stresses in cold-drawn pearlitic steel analyzed by energy-dispersive X-ray diffraction[J].Materials Characterization,2013,83: 152-160.
【11】GB/T 7704-2008 无损检测X射线应力测定方法[S].
【12】李益华,吴运新,龚海,等.应用X射线衍射法测定轴类工件中的残余应力[J].机械工程材料,2012,36(7): 96-99.
【13】夏之秋,顾伟生,朱世根.TP304不锈钢薄壁管的表面残余应力[J].理化检验-物理分册,2010,46(6): 356-359.
【14】徐萍,王伯健.钢丝拉拔过程中的残余应力[J].金属制品,2008,34(3): 1-4.
【15】杨帆.残余应力对连续拉拔珠光体钢丝力学性能的影响[J].材料导报,2010(5): 105-109.
【16】张尧武,曾卫东,史春玲,等.真空去应力退火对TC18钛合金残余应力及组织性能的影响[J].中国有色金属学报,2011(11): 2780-2785.
【17】周伟,周廉,于振涛.TA2环形管表面残余应力及消除[J].稀有金属材料与工程,2005(6): 1002-1004.
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