Enter marine-related query and AI bot will look for best match in our DB.

Cracks produced by the combined action of repeated or fluctuating stress and a corrosive environment, which produces the cracking at lower stress levels or fewer cycles of stress than would be the case if no corrosive environment were present.

Related Terms


An intercrystalline corrosion of boilerplate occurring in highly stressed zones. Cracking may result.


A material deterioration due to the co-joint action of corrosion and mechanical action.


Removal of films or metal by mechanical action and corrosion of active metal.


An action that causes molecules of a body to be slid past each other. Scissors perform a shearing effect on paper. Shear force is used to punch out holes in a sheet of stainless steel. Shear stress is stress caused by a force that tends to cause particles to slide past each other.


Stress corrosion cracking.


Polished metal strip of specified size and weight used to detect the corrosive action of liquid or gas products or to test the efficiency of corrosion-inhibitor additives. Also known as corrosion coupon.


Heat treating process that releases internal stress in hardened steel and increases toughness. Tempered steel will not crack under heavy stress or vibration or impact. Should be done as soon after hardening.


The time-dependent stretching or strain, heavily influenced by temperature, of a material under stress. Creep is a form of slip which occurs when metal is subjected to a tensile load at high temperature. Creep deformation is plastic and occurs even though the acting stress is 'below the yield stress' of material. At low temperatures the rate of creep is very small but at higher temperatures it becomes increasingly important. For this reason creep is commonly regarded as a high-temperature phenomenon associated with steam plant, gas-turbine technology and turbo-charger blading.

alt text

Plastic Strain from 0 to X which Occurs in Three Stages:

Primary or Transient Creep (0 to P) beginning at a fairly rapid rate which then decreases with time as strain - hardening sets in.

Secondary or Steady-State Creep (P to S) in which the 'rate' of strain is fairly uniform and at its lowest value.

Tertiary (tershari) Creep (S to X) in which the 'rate' of Creep increases rapidly so that fracture occurs at X. This stage coincides with necking of the material.

During Primary and Secondary Creep, plastic deformation takes place due to slip associated with dislocations movements within the grains. This leads to work hardening which, at high temperatures, is balanced by thermal softening. The dislocations eventually move out of the grains and into the grain boundaries. Tertiary Creep coincides with the initiation of micro-cracks at the 'grain boundaries', which leads to necking and the consequent rapid failure of the material. Hence, at the higher temperatures, fine-grained material creep more than course grained material since fine-grained material contains more grain boundaries per unit volume.


Longitudinal or transverse nonwatertight bulkheads fitted in a tank to decrease the swashing action of the liquid contents as a ship rolls and pitches at sea


The action of shutting off all fuel and ignition energy to the burner by means of safety control or controls such that restart cannot be accomplished without operator action.

Related questions

MarineProHelp 2018 - 2020

First time here? Check out the FAQ!

If you've arrived to new location and wonder how to dress comfortably according to weather, check Comfiesto