Can someone help me identify the differences between fracture surfaces in the weld heat-affected zone caused by hydrogen effects and those not caused by hydrogen effects?
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Who can tell me what the difference is between fracture surfaces formed under the influence of hydrogen and those formed without such influence in the pin test?
The fracture surface affected by hydrogen exhibits brittle fracture characteristics; the intergranular forces in the metal near the fracture surface are significantly reduced, resulting in an increase in hardness and pronounced fracturing； In the fracture free from hydrogen influence, obvious metal stretching is observed.