MICROSTRUCTURE AND MECHANICAL PROPERTY OF LASER WELDED JOINT FOR HYPOEUTECTOID U-Nb ALLOY

doi:10.3724/SP.J.1037.2013.00493

Acta Metall Sin

2014, Vol. 50

Issue (3): 379-386 DOI: 10.3724/SP.J.1037.2013.00493

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MICROSTRUCTURE AND MECHANICAL PROPERTY OF LASER WELDED JOINT FOR HYPOEUTECTOID U-Nb ALLOY

LI Yubin(

), WANG Wei, HE Jianjun, ZHANG Zhiqiang, ZHANG Tongyan

China Academy of Engineering physics, Mianyang 621900

Cite this article:

LI Yubin, WANG Wei, HE Jianjun, ZHANG Zhiqiang, ZHANG Tongyan. MICROSTRUCTURE AND MECHANICAL PROPERTY OF LASER WELDED JOINT FOR HYPOEUTECTOID U-Nb ALLOY. Acta Metall Sin, 2014, 50(3): 379-386.

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Abstract

The microstructures and mechanical properties of hypoeutectoid U-Nb alloy laser welded joint were investigated by optical microscopy (OM), X-ray diffractometer (XRD), transmission electron microscopy (TEM), split hopkinson pressure bar (SHPB) and other analysis apparatus. The results show that the microstructure of hypoeutectoid U-Nb alloy base metal is α-U+γ-U lamellar pearlite under isothermal heat treatment, while the laser welding seam is composed of α' lath martensite for pre-heated or α' twin martensite for no pre-heated with orthogonal crystal structure. The quasi-static tensile strength of welded joint (about 400 MPa) is much less than base metal and microstructures of weld, for the main reason of incomplete penetration weld and low fracture toughness. Between dynamic impact loading for base and welded joint, the strain rate of welded joint is lower than base metal, and the yield strength of welded joint is higher. Also, the compressive stress-strain curves indicated that the flow stresses for welded joint increased with the increase of strain rate and the obvious effect of strain rate hardening has been observed. At strain rate of 2000 s^-1, selected plastic deformation taking place in welded joint is due to the tremendous difference mechanic properties between weld seam and base metal, and the adiabatic shear band(ASB) only appears in the rest of welded joint.

Key words: hypoeutectoid U-Nb alloy laser welding microstructure mechanical property dynamic compression

Received: 15 August 2013

ZTFLH:	TG146.2
	TG174.3

Fund: Supported by Development Fund of China Academy of Engineering Physics (No.2011B0301055)

About author: null

李玉斌, 男, 1972年生, 博士

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	Yubin LI
	Wei WANG
	Jianjun HE
	Zhiqiang ZHANG
	Tongyan ZHANG

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00493 OR https://www.ams.org.cn/EN/Y2014/V50/I3/379

Fig.1

力学分析试样图

Fig.2

U-Nb合金基材微观结构和XRD谱

Fig.3

U-Nb合金焊接接头的宏观和微观结构

Fig.4

U-Nb合金焊缝的TEM像和EDS分析

Fig.5

U-Nb合金焊接接头的显微硬度

Fig.6

U-Nb合金焊接接头的应力-应变曲线

Fig.7

U-Nb合金焊接接头的断口形貌

Fig.8

不同冲击速率下U-Nb合金基材和焊接接头的应变速率-时间曲线

Fig.9

不同冲击速率下, U-Nb合金基材和焊接接头的应力-应变曲线

Fig.10

不同冲击速率动态压缩后U-Nb合金焊接接头的显微结构

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