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排序方式: 共有54条查询结果,搜索用时 15 毫秒
1.
The effect of deformation on the stress–corrosion cracking (SCC) of Al–Zn–Mg–Cu alloys is studied by slow strain rate technique (SSRT) and bolt‐loaded double cantilever beam (DCB) tests. Results show that with the deformation increasing, the undissolved particles and subgrain size decrease whereas the fraction of recrystallization increases after solution treatment. The susceptibility to SCC by SSRT and DCB tests varies on different deformation amount alloy, in which cause is discussed. 相似文献
2.
研究了商用Zr702在沸腾硝酸中应用于乏核燃料后处理工业的应力腐蚀开裂(SCC)行为和应力腐蚀敏感性(ISCC)。使用独立设计的慢应变率拉伸(SSRT)系统在沸腾的硝酸中获得应变率为10-5 s-1的Zr702的应力-应变曲线。进行微观表征以及数值分析以量化Zr702的SCC行为。结果表明,随着HNO3浓度的增加,Zr702的ISCC由5%明显增加到26.67%。商用Zr702在沸腾HNO3溶液中力学性能的急剧下降归因于试样表面的解理断裂,并且解理裂纹的深度随着HNO3浓度的增加而增加。最后,提出了预测商业Zr702在沸腾HNO3溶液中SCC行为的模型和方程。HNO3浓度、ISCC、断裂应力(σSCC)和解理裂纹深度(dcc)之间的定量关系可以使用高阶回归方程来描述和预测。 相似文献
3.
采用电化学测试的方法评价了两种强度的17-4PH不锈钢在海水中的阴极极化行为;采用充氢试验研究了两种强度的17-4PH不锈钢在-1.1V(SCE,下同)电位下阴极极化15d后的含氢量;采用慢应变速率试验研究了两种强度17-4PH不锈钢在充氢后的氢脆系数。结果表明:两种强度的17-4PH不锈钢在海水中的析氢转变电位均在-0.90V左右;低强度不锈钢的氢质量分数约为2.55×10~(-4)%,而高强度不锈钢的氢质量分数则高达6.84×10~(-4)%;试样充氢后,高强度不锈钢的脆性明显增加,而低强度不锈钢的脆性增加不明显,高强度不锈钢的氢脆系数远超过25%,此时材料已存在氢脆危险,而低强度不锈钢的氢脆系数约为18%左右,尚处于氢脆安全区。 相似文献
4.
《International Journal of Hydrogen Energy》2019,44(45):25054-25063
The tensile properties and crack propagation rate in a type 316 austenitic stainless steel prepared by vacuum induction melting method with different residual hydrogen contents (1.1–11.5 × 10−6) were systematically investigated in this research work. The room temperature tensile properties were measured under both regular tensile (12 mm/min) and slow tensile (0.01 mm/min) conditions, and the fracture properties of the tensile fractures with both rates were analyzed. It shows that the hydrogen induced plasticity loss of stainless steel strongly depends on the tensile rate. Under regular tensile condition, there is no plastic loss even when the hydrogen content is up to 11.5 × 10−6 while in the slow tensile condition, the plastic loss can be clearly identified rising with the increasing H contents. The fatigue crack propagation rate was tested at room temperature, and the crack growth rate formula (Paris) of the 316 stainless steels with varied H contents were obtained. The fatigue crack propagation rate test shows that the crack growth rate of the 316 stainless steel with 8.0–11.5 × 10−6 hydrogen is significantly higher than that of benchmark steel. 相似文献
5.
6.
Min-Su Han Seokcheol Ko Sang-Hyun Kim Seok-Ki Jang Seong-Jong Kim 《Metals and Materials International》2008,14(2):203-211
We report on the optimum corrosion protection potential range for stress corrosion cracking and hydrogen embrittlement of
5083-H112 Al alloy specimens using electrochemical methods and slow strain rate testing (SSRT) in seawater. In the results
of the cathodic polarization curve, the concentration polarization due to dissolved oxygen reduction reaction correspondeds
to a protection potential of OCP≈ −1.55 V. However, a potential of −1.2 V in the SSRT showed little effect of atomic hydrogen
evolution. Potentials less than −1.6 V are affected by atomic and molecular hydrogen. We thus concluded that the effect of
atomic hydrogen predominates. Overall, the optimum corrosion protection range for SCC and hydrogen embrittlement of 5083-H112
seems to be between −0.9 V and −0.7 V. 相似文献
7.
8.
慢应变拉伸速率和H_2S,Cl~-及H~+浓度对08Cr2AlMo钢应力腐蚀开裂的影响 总被引:1,自引:0,他引:1
通过慢应变速率拉伸、均匀设计和扫描电镜等方法,研究了慢应变拉伸速率和H2S,Cl-及H+浓度对08Cr2AlMo钢应力腐蚀开裂敏感性的影响。研究表明,随着拉伸应变速率的减小,08Cr2AlMo钢在饱和H2S溶液中的应力腐蚀敏感性基本呈单调增加的趋势,拉伸速率为5.67×10-6s-1时试样已发生应力腐蚀开裂。H2S,Cl-及H+浓度对08Cr2AlMo钢的应力腐蚀开裂敏感性具有重要影响作用,影响因素两两之间存在协同作用。在饱和H2S溶液中,杂质离子Cl-和H+对08Cr2AlMo钢的应力腐蚀开裂具有促进作用。 相似文献
9.
PWR核电站蒸汽发生器传热管和主管道的应力腐蚀破裂研究 总被引:2,自引:0,他引:2
用慢应变速率试验(SSRT)、恒载荷试验(CLT)和低周循环载荷试验方法研究以秦山和大亚湾核电站安全为目的的有关压力边界管道破裂始发事件应力腐蚀破裂(SCC)的行为,为评价管道的结构完整性提供支持性实验数据。研究的材料有核等级主管道焊接热影响区(WHAZ)316不锈钢(SS),核等级蒸汽发生器(SG)传热管材Incoloy-800、Inconel-600、Inconel-690和321SS。研究的影响因素包括材料冶金、表面喷丸处理、载荷、应变速率、循环载荷以及水化学条件对SCC的影响规律。 相似文献
10.
宋仁国 《武汉理工大学学报(材料科学英文版)》2009,24(1):111-113
Slow strain rate testing (SSRT) was employed to study the stress corrosion cracking (SCC) behavior of ZE41 magnesium alloy
in 0.01 M NaCl solution. Smooth tensile specimens with different thicknesses were strained dynamically in both longitudinal
and transverse direction under permanent immersions at a strain rate of 10−6 s−1. It is found that ZE41 magnesium alloy is susceptible to SCC in 0.01 M NaCl solution. The SCC susceptibility of the thinner
specimen is lower than that of the thicker specimen. Also, the longitudinal specimens are slightly more susceptible to SCC
than the transverse specimens. The SCC mechanism of magnesium alloy is attributed to the combination of anodic dissolution
with hydrogen embrittlement.
Funded by the National Natural Science Foundation of China (No. 50771093) 相似文献