PHASE TRANSFORMATION TEMPERATURE CONTROL OF WELD METAL OF LASER WELDED TiNi SHAPE MEMORY ALLOY JOINT

doi:10.3724/SP.J.1037.2012.00482

Acta Metall Sin

2013, Vol. 49

Issue (2): 199-206 DOI: 10.3724/SP.J.1037.2012.00482

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PHASE TRANSFORMATION TEMPERATURE CONTROL OF WELD METAL OF LASER WELDED TiNi SHAPE MEMORY ALLOY JOINT

YANG Chenggong¹⁾, SHAN Jiguo^1,2), REN Jialie¹⁾

1) Department of Mechanical Engineering, Tsinghua University, Beijing 100084
2) Key Laboratory for Advanced Materials Processing Technology, Ministry of Education,Tsinghua University, Beijing 100084

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YANG Chenggong, SHAN Jiguo, REN Jialie. PHASE TRANSFORMATION TEMPERATURE CONTROL OF WELD METAL OF LASER WELDED TiNi SHAPE MEMORY ALLOY JOINT. Acta Metall Sin, 2013, 49(2): 199-206.

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Abstract

The phase transformation temperature (PTT) of laser welded TiNi alloy joint is mainly determined by the PTT of its weld metal. A two-step approach is developed to control the PTT of weld metal, including Ni-plating and aging treatment. The Ni-plating increases the Ni content of weld metal, and the aging treatment improves the formation of precipitation phase. The effect of plating thickness and aging time on the PTT of weld metal is studied. The chemical composition, microstructure, crystal structure and PTT are analyzed by DSC, EDS, OM, SEM and XRD, respectively. The PTT controlling mechanism of the developed two-step approach is understood by investigating the effect of precipitation phase, grain preferred orientation, and lattice distortion on the elastic energy resilience of martensite and the resistance of phase transition. The increasing of Ni content in weld metal by Ni-plating can just rise up the elastic energy resilience of martensite, which causes the drop of PTT. The aging treatment not only increases the resistance of phase transition, but also reduces the elastic energy resilience of martensite. The compound effect increases the PTT of weld metal. By adjusting the plating thickness and the aging time of the two-step approach, both the elastic energy resilience of martensite and the resistance of phase transition can be controlled within a reasonable range. These measures keep the austenite start temperature (A_s) and finish temperature (A_f) of weld metal as the similar as that of base metal, thus the PTT of TiNi alloy joint is well controlled.

Key words: TiNi alloy laser welding weld metal phase transformation temperature Ni plating+ aging treatment

Received: 13 August 2012

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00482 OR https://www.ams.org.cn/EN/Y2013/V49/I2/199

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