问题
问答题 简答题
晶粒大小对金属的性能有什么影响？细化晶粒的方法有哪几种？
答案
参考答案：
常温下，晶粒越细，晶界面积越大，因而金属的强度、硬度越高，同时塑性、韧性也好高温下，晶界呈粘滞状态，在协助作用下易产生滑动，因而细晶粒无益，但晶粒太粗易产生应力集中，因而高温下晶粒过大过小都不好
方法：1：增大过冷度2：变质处理3：附加振动
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晶粒大小对金属的性能有什么影响？细化晶粒的方法有哪几种？
参考答案：
常温下，晶粒越细，晶界面积越大，因而金属的强度、硬度越高，同时塑性、韧性也好高温下，晶界呈粘滞状态，在协助作用下易产生滑动，因而细晶粒无益，但晶粒太粗易产生应力集中，因而高温下晶粒过大过小都不好
方法：1：增大过冷度2：变质处理3：附加振动
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| Everyone in China 1 Mid-Autumn Day. It usually comes 2 September or October. 3 that day everyone eats mooncakes. A mooncake is a delicious, round cake. It 4 like the moon. There are many different kinds of mooncakes. Some 5 nuts in them, and some have meat and eggs. My friend Li Lei likes the mooncakes 6 meat. But I think the 7 with nuts in them are nicer. Han Meimei 8 the nicest come from Guangdong. 9 night, families often stay in the open air near their houses. There they look at the moon and eat the mooncakes. 10 delicious they are! | ||||
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