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. The influence of such processing on the quenching sensitivity was investigated by different homogenization methods. The results show that the equilibrium η phase mainly precipitates at areas... time homogenization treatment (RT, 120 ℃/h to 465 ℃, 8 h), the recrystallization is observed at most of the areas and the alloy shows good quenching sensitivity but low hardness. When the holding time......
J. Cent. South Univ. (2019) 26: 768-778 DOI: https://doi.org/10.1007/s11771-019-4046-2 Sensitivity analysis of geomechanical parameters affecting a wellbore stability Abolfazl ABDOLLAHIPOUR1, Hamid... and sometimes even impossible. This work offers a systematic sensitivity analysis to quantify the amount of each parameter’s effect on the stability of a wellbore. Maximum wellbore wall displacement......
Identification of Heat Transfer Coefficients by Use Conditions of Quenching Oil Katsumi ICHITANI1 (1.Lubricants Research Laboratory, Idemitsu Kosan Co., Ltd., Chiba, Japan) 摘要:Heat transfer coefficients of the quench medium are necessary for heat-treatment simulation. Cooling characteristics of quenching oil vary with kinds and usage greatly. Users are selecting oil solutions that come up......
to a further 10% decrement in hardness due to slow quenching and therefore higher quench sensitivity. Key words: grain structure; Al-Zn-Mg-Cu-Cr alloy; dispersoids; quench sensitivity 1 Introduction Al-Zn-Mg-Cu alloys are often quench sensitive, i.e., their hardening capability by aging decreases after slow quenching from solution heat treatment temperature. Quench sensitivity receives great influence......
淬火敏感性[J]. 中国有色金属学报, 2008, 18(10): 1788-1794. ZHANG Yong, DENG Yunlai, ZHANG Xinming, et al. Quenching sensitivity of 7050 aluminum alloy hot-rolled plate[J]. The Chinese Journal of Nonferrous Metals... homogenized aluminum alloys were studied by end quenching test, scanning electron microscopy and transmission electron microscopy. The results show that hardness difference of the four alloys is 33......
残余应力分布(轧向) Fig. 2 Quenching residual stress distributions with various water temperatures (rolling direction) 图3 不同水温下淬火残余应力分布(横向) Fig. 3 Quenching residual stress distributions...%NaCl+5%KNO3溶液,20 ℃水,5%PAG溶液,相应的冷却能力顺序也是如此.表4所列为不同淬火介质下的应力水平及降低比例,相比于20 ℃水,5%NaCl+5%KNO3溶液下的淬火残余应力上升了10.0%左右. 表2 不同温度下应力水平及降低比例(负号代表压应力) Table 2 Quenching residual stresses (QRS......
Gas Quenching Small Components Paul Stratton1 (1.BOC, Sheffield, UK) 摘要:Gas quenching is an environmentally friendly and effective way of quenching components. However it has not been possible to apply it to small components because of the difficulties of jigging. A method of gas quenching such small components is described in which they are levitated in a confined gas stream. The method......
度. 关键词:7055铝合金；时效；淬火敏感效应 中图分类号:TG 146.1 文献标识码:A Influence of aging on quench sensitivity effect of7055 aluminum alloy ZHANG Xin-ming, LIU Sheng-dan, YOU Jiang-hai, ZHANG Chong, ZHANG Xiao-yan (School of Materials Science and Engineering, Central South University, Changsha 410083, China) Abstract: The influence of aging on the quench sensitivity effect......
, China Received 17 October 2013; accepted 23 April 2014 Abstract: The effects of sub-grain boundaries on the quenching sensitivity and the precipitation behavior in Al-7.01Zn-1.26Mg- 1.43Cu alloy were... strength, high toughness, and low quenching sensitivity, such as AA7085 and AA7081 [2,3]. The quenching sensitivity, which is especially critical for thick plats or heavy forgings of Al-Zn-Mg-Cu alloys......
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