Nghiên cứu xác định các tham số công nghệ gia công cơ nhiệt tối ưu hợp kim cu ni si

NGHIEN CU'U- iKAUyOI

NGHIEN CI>U XAC DINH CAC THAM S6 CONG NGHE

GIA CONG CO NHIET T6 | UU HOP KIM Cu-Ni-Si

STUDY ON DETERMINING OPTIMAL THERMOMECHANICAL PROCESS

PARAMETERS OF Cu-Ni-Si ALLOY

Philng liiin Anh, Phairo B^i Phird-c

Khoa Ca khi, Hgc vien Ky thuat Qu^ su, Bd Qudc phdng

TOM TAX

Bdi bdo ndy trinh bdy kit qud nghiin cuu dnh hudng cua cdc tham sd qua trinh ca nhiet den

dg cung vd do ddn dien cua hgp kim BCuNiSSi. Thdng qua quy hogch thuc nghiem true giao cdp 2

v&i cdc tham sd cdng nghe thay ddi gdm, muc dd biin dgng ngudi truac trong khodng (30-70) %,

nhiet do hda gid trong khodng (425-525) °C vd then gian hda gid trong khodng (3,5-8,5) h, nhdm tdc

gid da xdy dung dugc cdc hdm m^c tiiu, bieu dien suphu thugc cda dd cung, do dan diin vdo muc

do bien dgng ngudi truac, thai gian, nhiet dg hda gid dip theo vd xdc dinh cdc thdng sd cdng nghe

tdi uu khi gia cdng hgp kim BCuNi3Si. Thuc nghiem chi ra rang, sai sd cua cdc so lieu thtrc nghiem

so vai tinh todn khdng vugt qud 5 %.

Tu khda: Hgp Mm BCuNiSSi, gia cdng canhiet, bien dang ngudi, hda gid, dd cung dg ddn diin.

ABSTRACT

In this paper, effect of thermomechanical process parameters on hardness and electrical

conductivity ofCuNi3Si alloy was studied. Through the Orthogonal Experimental Desi^ (OED)

method with cold pre-deformation degree of (30-70) %, aging temperature of (425-525) "C and

aging time of (3.5-8.5) h, the authors built objective functions, that represented the dependence of

hardness and electrical conductivity on cold pre-deformation degree, aging time and temperature,

and determined the optimal technological parameters for fabrication ofCuNiSSi alloy. Variations

of the experimental results with theoretical calculations does not exceed 5 %.

Keywords: CuNiSSi alloy, thermomechanical treatment, cold deformation, aging, hardness,

electrical conductivity. <B

ISSN 0866 - 7056

TAP CHl CO KHi VIET NAM, Sd 1+2 nam 2017