da Rocha Sicknan Soares, Adabo Gelson Luis, Vaz Luis Geraldo, Henriques Guilherme Elias Pessanha
Department of Dental Materials and Prosthodontics, Araraquara Dental School, São Paulo State University (UNESP), Araraquara, SP, Brazil.
J Mater Sci Mater Med. 2005 Aug;16(8):759-66. doi: 10.1007/s10856-005-2614-5.
Heating titanium structures is assumed to relieve tensions induced by the casting process as well as possibly optimizing some mechanical properties. The aim of this investigation was to evaluate the effect of thermal treatments on tensile strength of commercially pure titanium (CP Ti) and Ti-6Al-4V alloy. Thirty dumbbell rods, with diameters of 3.0 mm at the central segment and lengths of 42 mm, were cast for each metal using the Rematitan System. CP Ti and Ti-6Al-4V specimens were randomly divided into three groups of ten: a control group that received no thermal treatment and two test groups. One (T1) was heated at 750 degrees C for 2 h and the other (T2) was annealed at 955 degrees C for 1 h and aged at 620 degrees C for 2 h. Tensile strength was measured with a universal testing machine (MTS model 810). Tensile strength means and standard deviations were statistically compared using a Kruskal-Wallis test at a alpha=0.05 significance level. No statistically significant differences in tensile strength were observed among CP Ti groups. For the Ti-6Al-4V alloy, the control and T1 groups revealed statistically higher tensile strengths when compared to the T2 group, with no significant difference between the control and T1 groups.
加热钛结构被认为可以缓解铸造过程中产生的应力，并可能优化一些机械性能。本研究的目的是评估热处理对工业纯钛（CP Ti）和Ti-6Al-4V合金拉伸强度的影响。使用Rematitan系统为每种金属铸造30根哑铃形棒材，其中心段直径为3.0 mm，长度为42 mm。CP Ti和Ti-6Al-4V试样随机分为三组，每组10个：一组为未进行热处理的对照组，另外两组为试验组。一组（T1）在750℃下加热2小时，另一组（T2）在955℃下退火1小时，然后在620℃下时效2小时。使用万能试验机（MTS型号810）测量拉伸强度。在α=0.05的显著性水平下，使用Kruskal-Wallis检验对拉伸强度均值和标准差进行统计学比较。在CP Ti各组之间未观察到拉伸强度的统计学显著差异。对于Ti-6Al-4V合金，与T2组相比，对照组和T1组的拉伸强度在统计学上更高，而对照组和T1组之间无显著差异。
