Case #1
Failed Kiln Chain
Our observations and testing indicate the microstructure of the received subject failed link and the new single link contain significant amounts of centerline porosity. This porosity reduces the cross-sectional area of the chain links and as such, reduces the strength of the chain as compared to a non-porous material of similar dimensions. In our opinion the failure of the chain, based on this metallurgical evaluation, is in part due to the effect of strength reduction due to material porosity.  There were no other obvious metallurgical indications either on the fracture surface or in the microstructure which would indicate that the failure was due to anything other than extensive porosity.