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Quarter-turn spiral wear pattern along length of rod, with box end heat check cracking
Axially oriented heat check crack and polished wear area
Typical network of heat check expansion cracking
Axially oriented cracks with inset micrograph of heat check cracking
Sample section with surface white layer of heat check hardening and surface crack
Sample separated to show crack surface and origin at surface
Axially oriented heat check crack and polished wear area
Heat check crack protruding through shoulder and across threads
Heat check crack protruding through shoulder and across threads
Heat check crack and polished wear area and internal view from 180deg
Typical analysis showing surface hardened layer and cracking
Heat check crack and polished wear area and internal view from 180deg
Typical analysis showing surface hardened layer and cracking
Sample section with surface white layer of heat check hardening
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