the joints do not embrittle in extreme cold
The high temperature treatment effaces the strains, coalesces the sulphide films in the ferrite which embrittle the steel and produces homogenity by rapid diffusion.
Of the many methods for gas brazing other metals, only the oxyacetylene gas has been found effective to date with titanium in that the gas employed does not embrittle the material.
These effects combine to make phosphorus an extremely effective embrittling agent, even when fracture occurs transgranularly.
Consequently, the material is embrittled by impurity segregation to interfacial boundaries.
Nickel and nickel alloys are susceptible to embrittlement by lead, sulfur, phosphorus, and other low-melting-point elements.
This is because some of the alloying elements form oxides and other compounds at the grain boundaries, embrittling the material.
The organic materials in grounds, gilding, paint films, and varnishes become embrittled with age and can no longer flex to accommodate movement in the support.
A serious embrittlement sometimes arises after prolonged treatment owing to the formation of cementitic films at the ferrite boundaries.
Its excellent toughness is due to a fine-grained structure of tough nickel-ferrite devoid of embrittling carbide networks, which are taken into solution during tempering at 570°C to form stable austenite islands.