In regard to non wear resistance of the white iron shot in the practical application process, alloy iron shot have been produced by means of adding alloying element and proper heat treatment.

针对白口铁丸在实际应用过程中不耐磨易破碎的现象，在白口铸铁中通过添加合金元素及适当热处理等手段生产合金铁丸。

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Three methods of surface self-nanocrystallization for iron and steel are ultrasonic shot peening, high energy shot peening and surface mechanical attrition treatment.

实现钢铁材料表面自身纳米晶化的主要方法有超声喷丸、高能喷丸和机械研磨处理等。

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Based on the experiments of shot peening to some specimens, the paper makes an approach to strengthening mechanism and fatigue resistance technology for nodular cast iron.

对试样进行了喷丸处理，进而探讨了球铁材料的强化机制和抗疲劳技术。

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On the par-five 13th, his booming drive around the corner left him less than 200 yards and an eight-iron shot for him into the green.

WSJ: Masters 2012: Bubba Watson Miracle Shot Lets Him Trump All Comers

Poulter posed over his 4-iron shot to the 13th green and was so stunned to see it come up short that he looked at his small gallery for the longest time, repeating loud enough for them to hear that he was only 138 yards from the front of the green.

NPR: A Monday Finish Turned Into A Monday Start

Likewise, Michal Thompson, who finished second in the US Amateur here five years ago, could not recall ever even needing even a 5-iron on his third shot until trying this monster.

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