HAZ Characterization and Mechanical Properties of QP980-DP980 Laser Welded Joints
HAZ Characterization and Mechanical Properties of QP980-DP980 Laser Welded Joints
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QP980-DP980 激光焊接接头的热影响区表征和机械性能
DOI：
10.1186/s10033-021-00596-x
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发表时间：
2021-08
影响因子：
4.2
通讯作者：
Yongqiang Li
中科院分区：
文献类型：
--
作者：
Junliang Xue;Peng Peng;Wei Guo;Mingsheng Xia;Caiwang Tan;Zh;ong Wan;Hongqiang Zhang;Yongqiang Li
采用光纤激光焊接技术制备了QP 980-DP 980异种钢焊接接头。两种钢焊接区均为完全马氏体组织，热影响区均为新生马氏体和部分回火马氏体。QP 980侧超临界热影响区的显微硬度（~ 549.5 Hv）高于WZ，这是由于马氏体较细。QP 980和DP 980的热影响区均存在软化区，软化区的显微硬度下降值分别为Δ 21.8Hv和Δ 40.9Hv。随着应变的增加，晶界处可能形成位错壁和滑移带，导致小角度晶界的形成。LAGB比HAGB更容易发生位错积累，导致显著的位错相互作用和裂纹的形成。电子背散射衍射（EBSD）结果表明，在拉伸试验过程中，不同变形条件下，DP 980侧亚临界热影响区的LAGB含量最高，导致位于DP 980侧亚临界热影响区的接头失效。QP 980-DP 980异种钢接头具有较高的延伸率（~ 11.21%）和极限抗拉强度由于QP 980-DP 980异种钢接头在拉伸过程中，（~ 8.2%和991.38 MPa）时，在性能优良的QP 980 BM上首先出现应变集中。杯突试验表明，由于WZ区存在大量脆性马氏体，且变形不均匀，异种钢焊接接头的杯突力最小（~ 5.92mm），峰值冲压力最大（~ 28.4kN）。
AbstractThe QP980-DP980 dissimilar steel joints were fabricated by fiber laser welding. The weld zone (WZ) was fully martensitic structure, and heat-affected zone (HAZ) contained newly-formed martensite and partially tempered martensite (TM) in both steels. The super-critical HAZ of the QP980 side had higher microhardness (~ 549.5 Hv) than that of the WZ due to the finer martensite. A softened zone was present in HAZ of QP980 and DP980, the dropped microhardness of softened zone of the QP980 and DP980 was Δ 21.8 Hv and Δ 40.9 Hv, respectively. Dislocation walls and slip bands were likely formed at the grain boundaries with the increase of strain, leading to the formation of low angle grain boundaries (LAGBs). Dislocation accumulation more easily occurred in the LAGBs than that of the HAGBs, which led to significant dislocation interaction and formation of cracks. The electron back-scattered diffraction (EBSD) results showed the fraction of LAGBs in sub-critical HAZ of DP980 side was the highest under different deformation conditions during tensile testing, resulting in the failure of joints located at the sub-critical HAZ of DP980 side. The QP980-DP980 dissimilar steel joints presented higher elongation (~ 11.21%) and ultimate tensile strength (~ 1011.53 MPa) than that of DP980-DP980 similar steel joints, because during the tensile process of the QP980-DP980 dissimilar steel joint (~ 8.2% and 991.38 MPa), the strain concentration firstly occurred on the excellent QP980 BM. Moreover, Erichsen cupping tests showed that the dissimilar welded joints had the lowest Erichsen value (~ 5.92mm) and the peak punch force (~ 28.4kN) due to the presence of large amount of brittle martensite in WZ and inhomogeneous deformation.
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影响因子：
2.3
作者：
Qiangguo Li;Xuefei Huang;Weigang Huang
通讯作者：
Qiangguo Li;Xuefei Huang;Weigang Huang
影响因子：
8.4
作者：
R. S. Sharma;P. Molian
通讯作者：
R. S. Sharma;P. Molian
激光偏置对铝/黄铜异种合金激光钎焊的影响
影响因子：
6.2
作者：
Zhou, L.;Li, Z. Y.;Feng, J. C.
通讯作者：
Feng, J. C.
光纤激光焊接QP980钢的显微组织与力学性能
DOI：
10.1016/j.jmatprotec.2018.02.015
发表时间：
2018-06-01
影响因子：
6.3
作者：
Guo, Wei;Wan, Zhandong;Peng, Yun
通讯作者：
Peng, Yun
DOI：
10.1016/j.msea.2016.03.042
发表时间：
2016-04
影响因子：
6.4
作者：
Qiangguo Li;Xuefei Huang;Weigang Huang
通讯作者：
Qiangguo Li;Xuefei Huang;Weigang Huang