TY - JOUR
T1 - Step aging of a sintered Ti-13mass%Cr alloy
AU - Takaki, Setsuo
AU - Ikeda, Yasuyuki
AU - Sugaya, Kouji
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1996
Y1 - 1996
N2 - The behavior of recovery of o) and transition from u to a was investigated by means of hardnesss testing, tensile testing and microstruclural examinations in a Ti-13mass%Cr alloy produced by powder metallurgy. Sintered materials were subjected to the solution treatment of 1273K-1.8ks followed by water quenching, in advance. Age-hardening by iu precipitation is most significant in the aging at around 623K, and hardness reaches the maximum after 3ks aging at 623K. Age-hardened specimens undergo softening during secondary aging at temperatures above 623K (step aging) due to recovery of ui. When the secondary aging temperature is higher than 823K, hardness of pre-aged specimens drops to that of as solution-treated materials, because all of u can completely recover. In the intercritical temperatures between 623K and 823K, however, a part of CD retains and provides the nuclei for a precipitation. This results in a fine dispersion of a and a great increase in tensile strength of the alloy with step aging.
AB - The behavior of recovery of o) and transition from u to a was investigated by means of hardnesss testing, tensile testing and microstruclural examinations in a Ti-13mass%Cr alloy produced by powder metallurgy. Sintered materials were subjected to the solution treatment of 1273K-1.8ks followed by water quenching, in advance. Age-hardening by iu precipitation is most significant in the aging at around 623K, and hardness reaches the maximum after 3ks aging at 623K. Age-hardened specimens undergo softening during secondary aging at temperatures above 623K (step aging) due to recovery of ui. When the secondary aging temperature is higher than 823K, hardness of pre-aged specimens drops to that of as solution-treated materials, because all of u can completely recover. In the intercritical temperatures between 623K and 823K, however, a part of CD retains and provides the nuclei for a precipitation. This results in a fine dispersion of a and a great increase in tensile strength of the alloy with step aging.
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U2 - 10.2320/matertrans1989.37.850
DO - 10.2320/matertrans1989.37.850
M3 - Article
AN - SCOPUS:0030120461
SN - 0916-1821
VL - 37
SP - 850
EP - 854
JO - Materials Transactions
JF - Materials Transactions
IS - 4
ER -