热输入对Q550钢焊接接头动态拉伸变形行为的影响*

doi:10.11901/1005.3093.2016.137

材料研究学报

2016, Vol. 30

Issue (11): 811-818 DOI: 10.11901/1005.3093.2016.137

论文

本期目录 | 过刊浏览

热输入对Q550钢焊接接头动态拉伸变形行为的影响*

郭晓彤,王磊(

),覃称蕾,袁旭

东北大学材料各向异性与织构教育部重点实验室沈阳 110819

Effect of Heat Input on Dynamic Tensile Deformation Behavior of Q550 Steel

Xiaotong GUO,Lei WANG(

),Chenglei QIN,Xu YUAN

Key Lab for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110819, China

引用本文:

郭晓彤, 王磊, 覃称蕾, 袁旭. 热输入对Q550钢焊接接头动态拉伸变形行为的影响*[J]. 材料研究学报, 2016, 30(11): 811-818.
Xiaotong GUO, Lei WANG, Chenglei QIN, Xu YUAN. Effect of Heat Input on Dynamic Tensile Deformation Behavior of Q550 Steel[J]. Chinese Journal of Materials Research, 2016, 30(11): 811-818.

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摘要:

研究了不同热输入焊条电弧焊Q550钢接头的显微组织特征, 及其在不同应变速率下的力学行为。结果表明, 在热输入小于18 kJ/cm时, 随着热输入的增加接头熔合区针状铁素体的含量增多, 热影响区粗晶区的晶粒尺寸增大。随着应变速率的提高接头断裂延伸率和抗拉强度均有不同程度的提高, 断口的大韧窝深度变大, 小韧窝区域减少。在高速拉伸过程中位错滑移的阻力增大, 位错滑移速度远低于载荷增大速度, 随着应变速率的提高屈服强度和抗拉强度都提高。随着热输入的增加接头熔合区针状铁素体的比率增大, 这是其拉伸性能对应变速率的敏感性增大的主要原因。

关键词 ：金属材料, 低合金高强度钢, 焊条电弧焊, 热输入, 应变速率, 变形行为

Abstract：

Q550 steel was welded by shielded metal arc welding with varying heat inputs, and then the microstructure of the weld joint was characterized, while the effect of strain rate on its mechanical behavior were examined. The results show that when the heat input below 18 kJ/cm, with the increasing heat input, acicular ferrite content of the fusion zone and the grain size of the heat affected zone increased. With the increasing strain rate, the elongation and tensile strength of the welded joint increased to different extents. With the increasing heat input, the depth of large dimples increased, while the area of small dimples decreased in the fractured surface. During high speed tension, the resistance to dislocation slip increased, however the propagating rate of dislocation slip far behind the increasing speed of load, which led to increase in yield strength and tensile strength with the increase of strain rate. With the increasing heat input, acicular ferrite content of fusion zone increased, which is the main reason for the increase of sensitivity of tensile property to strain rate.

Key words： metalic materials low alloy high strength steel shielded metal arc welding heat input strain rate deformationbehavior

收稿日期: 2016-03-14

基金资助:*国家级大学生创新创业训练计划资助项目201510145041

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表1 Q550钢的化学成分

表2 焊条电弧焊焊材的熔敷金属化学成分及力学性能

表3 焊条电弧焊的热输入参数

图1 拉伸试样尺寸和取样方式示意图

图2 Q550金相显微照片

图3 低热输入熔合区的组织(图b、c、d分别为I、II、III区域的高倍显微组织)

图4 低热输入热影响区的显微组织

图5 不同热输入下焊接接头的显微组织

图6 焊接接头的硬度分布

图7 Q550钢动态拉伸应力-应变曲线

图8 Q550钢不同应变速率条件下动态拉伸强度和塑性变化

图9 应变速率为102 s-1不同热输入接头的拉伸应力-应变曲线

图10 不同热输入条件下动态拉伸强度和塑性变化

图11 不同应变速率下Q550钢焊条电弧焊焊接接头拉伸断口纤维区SEM形貌

图12 不同应变速率Q550钢焊条电弧焊焊接接头拉伸断口纤维区的SEM形貌

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