金相组织对钢的接触疲劳寿命有重要作用：板条马氏体组织比片状马氏体组织抗接触疲劳性能好，适量的残余奥氏体可改善钢的抗接触疲劳性能。
The presence of a certain amount of retained austenite improves the resistance to contact fatigue failure. The lath martensite has better resistance than the plate twin martensite.
其硬化组织主要为隐晶马氏体，片状石墨基本保持原形貌不变。
The laser hardening microscopic structures are mainly very fine martensite and the original pattern of flake graphite basically remain.
其硬化组织主要为隐晶马氏体，片状石墨基本保持原形貌不变。
The laser hardening microscopic structures are mainly very fine martensite and the original pattern of flake graphite basically remain.
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