Effect Of Ultra Shot Peening On Casting Shape Memory Alloy

Author:  Y Watanabe, K Hattori, M Handa, Y Yoshimi, T Inaba
Source:  Conf Proc: ICSP-10 Tokyo, Japan 2008
Doc ID:  2008033
Year of Publication:  2008
ABSTRACT In order to overcome difficulties that have hindered precision casting of shape memory alloys, we made a ingots created with Self Propagating High Temperature Synthetic Method (SHS) which eventually led us to the success of precision casting utilizing lost wax process. Also we have succeeded in creating functional products that are treated with the ultrasonic shot peening process, improving the resiliency against deformation and fatigue strength. Although the common casting products are created using many different kinds of metals and alloys, casting products utilizing shape memory alloys have not been widely adopted due to a lack of successfully produced products. The reasons for this are that there was much difficulty in developing equal property structures that does not allow gravity segregation of Ni-Ti. Also its essential characteristics (being the shape memory and super elasticity), the makeup of component had to overcome the structural weaknesses in order to withstand from possible deformation.

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