It is shown that a regular pattern distribution of scattered alloying zones which surrounded by phase transformation zone can retard the fatigue crack growth rate and improve the fatigue life.
研究表明，大量规则分布、互不重叠的合金化区及其周围的相变硬化区从总体上降低了疲劳裂纹扩展速率，提高了材料的疲劳寿命。
It is found that the structure of the hardened phase in melting and transformation zone is very tiny, the martensite appears to be tiny acicular and possesses twin substructure.
熔化区和固态相变区硬化相组织极为细小，马氏体呈微细针状，具有孪晶亚结构。
The width and depth of the phase transformation hardened zone were measured.
通过灰铸铁激光相变硬化实验，实测了硬化层深度和宽度。
To quench 20 steel in critical zone under different intensity alternation magnetic field and to observe the microstructure after phase transformation.
对20钢进行不同强度交流磁场下的临界区淬火处理，观察相变后的组织。
To quench 20 steel in critical zone under different intensity alternation magnetic field and to observe the microstructure after phase transformation.
对20钢进行不同强度交流磁场下的临界区淬火处理，观察相变后的组织。
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