Result shows: there are twin in the boride layer and dislocation network in ferrite of the trasitional region; distance between lamellae of pearlite is reduced and some cementites are broken.

• 结果表明,磨损表层的硼化物中产生孪晶和层错,过渡区的铁素体中产生位错网,珠光体片层间距变小,部分渗碳体碎化。