Optimum chemical composition of stainless steel 1Kh18N9T

Metallurgist ◽  
1958 ◽  
Vol 1 (5) ◽  
pp. 303-305
Author(s):  
M. I. Vinograd
Keyword(s):  
Stainless Steel ◽  
Chemical Composition ◽  
Steel 1Kh18n9t ◽  
Optimum Chemical Composition ◽  
Optimum Chemical

Modeling the influence of chemical composition on compressive strength behavior of alkali-activated phosphorus slag cement using statistical design

2018 ◽  
Vol 45 (12) ◽  
pp. 1073-1083 ◽  
Author(s):  
Hamideh Mehdizadeh ◽  
Ebrahim Najafi Kani
Keyword(s):  
Compressive Strength ◽  
Chemical Composition ◽  
Statistical Design ◽  
Molar Ratio ◽  
Statistical Experimental Design ◽  
Molar Ratios ◽  
Strength Behavior ◽  
Optimum Chemical Composition ◽  
Optimum Chemical ◽  
Alkali Activated

In this study, a statistical experimental design based on response surface methodology (RSM) has been applied to predict and optimize the compressive strength of alkali-activated phosphorus slag in different ages (3, 7, and 28 days). For this purpose, the binder samples were prepared with different molar ratios of SiO2/Na2O (S/N), Na2O/Al2O3(Na/Al), and H2O/Al2O3(H/Al) as alkali activator. Results showed that S/N molar ratio plays its role in early ages of curing and Na/Al molar ratio, and showed its significant effect on 7 and 28 days of compressive strength. H/Al molar ratio had the most significant effect on compressive strength compared to the other parameters. The derived RSM models were statistically adequate and could be used to predict the compressive strength. The optimum chemical composition of activator to obtain the highest compressive strength was achieved as 0.39, 1.34, and 30 for S/N, Na/Al, and H/Al molar ratios, respectively, with compressive strength of 30, 65, and 100 MPa at 3, 7, and 28 days of curing.

Phase Evolution and Microwave Dielectric Properites in the Systems of (Mg1-xCax)2SiO4 Ceramics

2010 ◽  
Vol 152-153 ◽  
pp. 801-804 ◽  
Author(s):  
Kai Xin Song ◽  
Zhi Hua Ying ◽  
Liang Zheng ◽  
Zheng Liu ◽  
Hui Bin Qin
Keyword(s):  
Dielectric Properties ◽  
Chemical Composition ◽  
Microwave Dielectric Properties ◽  
Relative Dielectric Constant ◽  
Secondary Phase ◽  
Phase Evolution ◽  
Absolute Value ◽  
Microwave Dielectric ◽  
Optimum Chemical Composition ◽  
Optimum Chemical

In this paper, the microwave dielectric properties in the systems of nominal chemical composition (Mg1-xCax)2SiO4 (0≤x≤0.5)ceramics were investigated, together with their phase evolution. With the increase of x value, the major phase in the ceramic systems gradually changes from Mg2SiO4 to MgCaSiO4, besides with the some secondary phase of MgSiO3 and Ca2MgSi2O7, The relative dielectric constant in the systems of ceramics gradually increased from 6.8 to 8.7. The quality factor of value was well improved, and especially, the absolute value of the ceramic resonant frequency of temperature coefficients was optimized to reach zero, from -61 to +3 . The best optimum chemical composition was equal to 0.4, where the microwave dielectric properties was = 7.2, = 24,170 GHz, = +5 .

scholarly journals Failure Analysis of Shaft Circulating Water Pump (CWP) used in Power Plant

2018 ◽  
Vol 159 ◽  
pp. 02027 ◽  
Author(s):  
Abdul Hamid ◽  
Sri Nugroho ◽  
Gunawan Dwi Haryadi ◽  
Khaeroman
Keyword(s):  
Stainless Steel ◽  
Chemical Composition ◽  
Power Plant ◽  
Failure Analysis ◽  
Fatigue Cracking ◽  
Hardness Test ◽  
Water Pump ◽  
Circulating Water ◽  
Pump Shaft ◽  
Sem Test

Pump shafts are generally exposed to the liquid being pumped either on a continual basis or at certain locations along the length of the shaft. The shaft material is austenitic stainless steel, description ASTM AU 79 TY 316. The purpose of this study is to determine the failure of the water pump shaft used in the power plant. Metallography is the study of structure metal shaft can used as a means for CWP metal pelleting (Circulating Water Pump), for the purpose of damaged or deeply degraded areas. SEM test is used to know the beginning of the crack (crack initiation). EDS test is used to chemical composition and Vikers hardness test is also used to know the hardness material. These three tests to support in analyzing the failure of the pump shaft. The conclusion of this failure analysis is the shaft material has porosity. Fatigue cracking comes from the outer surface area.

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