A Comparison of Hydrogen and Mercury Embrittlement in Monel at Room Temperature

1986 ◽  
Vol 108 (1) ◽  
pp. 31-36 ◽  
Author(s):  
L. B. Traylor ◽  
C. E. Price
Keyword(s):  
Crack Initiation ◽  
Strain Rate ◽  
Room Temperature ◽  
Tensile Tests ◽  
Cohesive Strength ◽  
Slow Strain Rate ◽  
Transgranular Crack ◽  
Monel 400

Slow strain rate tensile tests were performed on annealed and cold drawn Monel 400 and Monel R405 at room temperature in air, mercury, and electrolyte hydrogen. Hydrogen and mercury caused embrittlement with the fractures having the same specific features. Crack initiation was largely intergranular but an increasing proportion of transgranular cracking occurred subsequently, especially in the presence of hydrogen and for Monel R405. It is believed that the decreased cohesive strength and enhanced shear models of embrittlement apply to the intergranular and transgranular crack modes respectively.

scholarly journals Influence of strain rate and heat treatments on tensile and creep properties of Zn-0.15Cu-0.07Ti alloys

DYNA ◽  
2016 ◽  
Vol 83 (195) ◽  
pp. 77-83 ◽  
Author(s):  
María José Quintana Hernández ◽  
José Ovidio García ◽  
Roberto González Ojeda ◽  
José Ignacio Verdeja
Keyword(s):  
Strain Rate ◽  
Room Temperature ◽  
Rolling Direction ◽  
Tensile Tests ◽  
Strain Rates ◽  
Creep Tests ◽  
Design Problems ◽  
Creep Properties ◽  
Heat Treated ◽  
Zn Alloys

The use of Cu and Ti in Zn alloys improves mechanical properties as solid solution and dispersoid particles (grain refiners) may harden the material and reduce creep deformation. This is one of the main design problems for parts made with Zn alloys, even at room temperature. In this work the mechanical behavior of a Zn-Cu-Ti low alloy is presented using tensile tests at different strain rates, as well as creep tests at different loads to obtain the value of the strain rate coefficient m in samples parallel and perpendicular to the rolling direction of the Zn strip. The microstructure of the alloy in its raw state, as well as heat treated at 250°C, is also analyzed, as the banded structure produced by rolling influences the strengthening mechanisms that can be achieved through the treatment parameters.

Superplasticity and Microstructure Evolution of Electrodeposited Nanocrystalline Nickel

2007 ◽  
Vol 551-552 ◽  
pp. 539-544 ◽  
Author(s):  
S. Ding ◽  
Kai Feng Zhang ◽  
Guo Feng Wang
Keyword(s):  
Grain Size ◽  
Strain Rate ◽  
Room Temperature ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Intergranular Cracking ◽  
Mean Grain Size ◽  
Electrodeposited Nickel ◽  
Superplastic Properties

Nanocrystalline pure nickel (nc-Ni) was produced by pulse electrodeposition and its superplastic properties at and above room temperature were investigated. The electrodeposited nickel has a narrow grain size distribution with a mean grain size of 70nm. Uniaxial tensile tests at room temperature showed that nc-Ni has a limited plasticity but high tensile strength up to 1GPa at strain rates between 10-5 and 10-2s-1. However, when the temperature increased to 420 and higher, test specimens showed uniform deformation and the elongation value was larger than 200%. A maximum elongation value of 380% was observed at 450°C and a strain rate of 1.67x10-3s-1, SEM and TEM were used to examine the microstructures of the as-deposited and deformed specimens. The results indicated that fracture was caused by intergranular cracking and most cracks were originated from the brittle oxide formed during the tensile test. Grain coarsening was observed in the deformed specimen. The role of temperature and strain on grain growth was evaluated by comparing the microstructure of deformed samples with that of samples statically annealed. Deformation mechanism was discussed based upon the deformed microstructure and strain rate jump tests.

Effect of High Temperature Caliber Rolling on Microstructure and Room Temperature Tensile Properties of Mg-3Al-1Zn (AZ31) Alloy

2013 ◽  
Vol 209 ◽  
pp. 6-9 ◽  
Author(s):  
Rajendra Doiphode ◽  
S.V.S. Narayana Murty ◽  
Nityanand Prabhu ◽  
Bhagwati Prasad Kashyap
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Yield Strength ◽  
Strain Rate ◽  
Tensile Properties ◽  
Room Temperature ◽  
Tensile Tests ◽  
Az31 Alloy ◽  
Rolling Temperature ◽  
Grain Sizes

Mg-3Al-1Zn (AZ31) alloy was caliber rolled at 250, 300, 350, 400 and 450 °C. The effects of caliber rolling temperature on the microstructure and tensile properties were investigated. The room temperature tensile tests were carried out to failure at a strain rate of 1 x 10-4s-1. The nature of stress-strain curves obtained was found to vary with the temperature employed in caliber rolling. The yield strength and tensile strength followed a sinusoidal behaviour with increasing caliber rolling temperature but no such trend was noted in ductility. These variations in tensile properties were explained by the varying grain sizes obtained as a function of caliber rolling temperature.

Slow Strain Rate Fracture Characteristics of Steel and Aluminum Alloys Tested in Mercury Environments

1989 ◽  
Vol 111 (3) ◽  
pp. 229-234 ◽  
Author(s):  
J. J. Krupowicz
Keyword(s):  
Aluminum Alloy ◽  
Strain Rate ◽  
Rate Sensitivity ◽  
Tensile Tests ◽  
Slow Strain Rate ◽  
304 Stainless Steel ◽  
Mercury Species ◽  
Ambient Conditions ◽  
Aluminum Alloy 5083 ◽  
Type 304

Slow strain rate tensile tests performed on Type 304 stainless steel, A516 Grade 70 C-Mn steel, and aluminum alloy 5083 revealed that all three materials were susceptible to varying degrees of mercury liquid metal embrittlement (LME) at ambient conditions. Both Type 304 stainless and A516 Grade 70 C-Mn steels exhibited significant strain rate sensitivity to LME, while aluminum alloy 5083 embrittlement was independent of strain rate over the range tested (8.3 × 10−3 to 5.0 × 10−7 s−1). Ductility (reduction in area) and toughness losses for tests in mercury compared to respective tests in air indicated that aluminum alloy 5083 embrittlement was more acute than either steel. Crack arrest (secondary cracking) characteristics and reactions to different mercury species also suggested that Type 304 stainless and A516 Grade 70 C-Mn steels were less susceptible to mercury LME than aluminum alloy 5083.

Serrated Flow in an 11Cr Ferritic/Martensitic Steel

2014 ◽  
Vol 894 ◽  
pp. 125-128 ◽  
Author(s):  
Zhi Qiang Xu ◽  
Yin Zhong Shen ◽  
Bo Ji ◽  
Sheng Zhi Li ◽  
Ai Dang Shan
Keyword(s):  
Tensile Stress ◽  
Strain Rate ◽  
Yield Stress ◽  
Room Temperature ◽  
Martensitic Steel ◽  
Flow Behavior ◽  
Tensile Tests ◽  
Ultimate Tensile Stress ◽  
Strain Rates ◽  
Serrated Flow

Serrated flow behavior of an 11Cr ferritic/martensitic steel was investigated through tensile tests at initial strain rates of 2×10-510-3 s-1 at temperatures ranging from room temperature to 973 K. Serrated flow occurred at three temperature regions of room temperature, 573 K and 773973 K when tensile tests were conducted at a strain rate of 2×10-4 s-1. Serrations are also observed in the steel during tension at temperatures of 573 K and 773973 K at a strain rate of 2×10-5 s-1. With increasing tensile temperature, the yield stress and ultimate tensile stress of the steel were gradually decreased and quickly dropped at temperatures higher than 773 K, while the elongation of the steel was decreased to a minimum at 600 K, and then dramatically increased at temperatures higher than 600 K.

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