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纳米贝氏体焊接接头的冶金表征：再生技术与焊后热处理

Metallurgical Characterization of Welded Joint of Nanostructured Bainite: Regeneration Technique versus Post Welding Heat Treatment.

作者信息

Królicka Aleksandra, Radwański Krzysztof, Janik Aleksandra, Kustroń Paweł, Ambroziak Andrzej

机构信息

Department of Metal Forming, Welding and Metrology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland.

Łukasiewicz Research Network-Institute for Ferrous Metallurgy, K. Miarki 12-14, 44-100 Gliwice, Poland.

出版信息

Materials (Basel). 2020 Oct 29;13(21):4841. doi: 10.3390/ma13214841.

DOI:10.3390/ma13214841
PMID:33138209
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7663292/
Abstract

One of the main limitations in application of nanostructured carbide-free bainite as a construction material is the difficulty of joining. This research presents a structural characterization of welded joints of medium carbon 55Si7 grade steel after the welding process with a regeneration technique as well as post welding heat treatment (PWHT). The hardness distribution of the welded joint with regeneration exhibit an overall decrease in hardness when compared to the base material and a significant decrease in hardness was observed in the heat-affected zone (HAZ). Unfavorable hardness distribution was caused by the presence of diffusion-type transformations products (pearlite) in the HAZ and bainite degradation processes. On the other hand, welding with the PWHT promotes the achievement of a comparable level of hardness and structure as in the base material. However, a slight decrease in hardness was observed in the weld zone due to the micro-segregation of the chemical composition caused by the indissoluble solidification structure. Based on the structural analysis, it was found that steel with relatively low hardenability (55Si7) should be welded using PWHT rather than a regeneration technique.

摘要

将纳米结构无碳化物贝氏体用作建筑材料的主要限制之一是连接困难。本研究对采用再生技术以及焊后热处理（PWHT）进行焊接后的中碳55Si7级钢焊接接头进行了结构表征。与母材相比，采用再生技术的焊接接头的硬度分布总体上有所降低，并且在热影响区（HAZ）观察到硬度显著下降。热影响区中扩散型转变产物（珠光体）的存在以及贝氏体降解过程导致了不利的硬度分布。另一方面，采用焊后热处理进行焊接有助于实现与母材相当的硬度和结构水平。然而，由于不溶性凝固组织导致的化学成分微观偏析，在焊缝区观察到硬度略有下降。基于结构分析，发现淬透性相对较低的钢（55Si7）应采用焊后热处理而非再生技术进行焊接。

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本文引用的文献

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Electron backscatter diffraction on pearlite structures in steel.钢中珠光体组织的电子背散射衍射
J Microsc. 2006 Dec;224(Pt 3):256-63. doi: 10.1111/j.1365-2818.2006.01702.x.