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钨极气体保护电弧焊Fe-17Mn-5Si-10Cr-4Ni-(V, C)形状记忆合金的微观结构与形状记忆性能

Microstructure and Shape Memory Properties of Gas Tungsten Arc Welded Fe-17Mn-5Si-10Cr-4Ni-(V, C) Shape Memory Alloy.

作者信息

Kim Dohyung, Kim Taeyoon, Ji Changwook, Ji Sangwon, Lee Wookjin, Kim Wangryeol

机构信息

School of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.

School of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea.

出版信息

Materials (Basel). 2024 Sep 16;17(18):4547. doi: 10.3390/ma17184547.

DOI:10.3390/ma17184547
PMID:39336288
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11433442/
Abstract

In this study, microstructure, mechanical, and shape memory properties of the welded Fe-based shape memory alloy (Fe-SMA) plates with a nominal composition of Fe-17Mn-5Si-10Cr-4Ni-(V, C) (wt.%) by gas tungsten arc welding were investigated. The optimal heat input to ensure full penetration of the Fe-SMA plate with a thickness of 2 mm was found to be 0.12 kJ. The solidified grain morphology adjacent to the partially melted zone was columnar, whereas the equiaxed morphology emerged as solidification proceeded. The ultimate tensile decreased after welding owing to the much larger grain size of the fusion zone (FZ) and heat-affected zone (HAZ) than that of the base material (BM). Weldment showed lower pseudoelastic (PE) recovery strain and higher shape memory effect (SME) than those of the plate, which could be ascribed to the large grain size of the FZ and HAZ. Recovery stress (RS) slightly decreased after welding owing to lower mechanical properties of weldment. On the other hand, aging treatment significantly improved all PE recovery, SME, and RS via carbide precipitation. Digital image correlation analysis revealed that HAZ showed the lowest SME after heating and cooling, implying that the improved SME of FZ compensated for the low SME of the HAZ.

摘要

在本研究中，对名义成分为Fe-17Mn-5Si-10Cr-4Ni-(V, C)（重量百分比）的铁基形状记忆合金（Fe-SMA）焊接板的微观结构、力学性能和形状记忆性能进行了研究。发现确保2mm厚的Fe-SMA板完全熔透的最佳热输入为0.12kJ。靠近部分熔化区凝固的晶粒形态为柱状，而随着凝固的进行出现等轴形态。由于熔合区（FZ）和热影响区（HAZ）的晶粒尺寸比母材（BM）大得多，焊接后极限抗拉强度降低。焊件的伪弹性（PE）回复应变低于板材，形状记忆效应（SME）高于板材，这可能归因于FZ和HAZ的大晶粒尺寸。由于焊件力学性能较低，焊接后回复应力（RS）略有降低。另一方面，时效处理通过碳化物析出显著改善了所有的PE回复、SME和RS。数字图像相关分析表明，热影响区在加热和冷却后的形状记忆效应最低，这意味着熔合区形状记忆效应的改善补偿了热影响区较低的形状记忆效应。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/6f9bf3d905fb/materials-17-04547-g014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/de5640c693e3/materials-17-04547-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/f03b8d0bb217/materials-17-04547-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/ac59de34aca1/materials-17-04547-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/0c87f740ca66/materials-17-04547-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/48a961607b17/materials-17-04547-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/6f9bf3d905fb/materials-17-04547-g014.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/29d06a8c6479/materials-17-04547-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/23eeace5c014/materials-17-04547-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/62d09bde3808/materials-17-04547-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/eb3d1670d980/materials-17-04547-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/3f53e5f75151/materials-17-04547-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/07ddbb8f5763/materials-17-04547-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/b9fc79e849ca/materials-17-04547-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/de5640c693e3/materials-17-04547-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/f03b8d0bb217/materials-17-04547-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/ac59de34aca1/materials-17-04547-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/0c87f740ca66/materials-17-04547-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/5a8d8d651b6e/materials-17-04547-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/48a961607b17/materials-17-04547-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c509/11433442/6f9bf3d905fb/materials-17-04547-g014.jpg

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