塑性是金属可锻性中的一个指标。压力加工时,可以改变变形条件;但不能改变金属的塑性。...
Saturday, September 2, 2023
Saturday, March 4, 2023
Wednesday, April 3, 2024
气体保护焊的焊接热影响区一般都比手工电弧焊的小,原因是()。A、保护气体保护严密B、焊接电流小C、保护气体对电弧有压缩作用D、焊接电弧热量少...
Wednesday, May 17, 2023
对于线型聚合物,在注射成形时应加热到黏流态,在挤出成形时应加热到...
Sunday, September 11, 2022
Sunday, February 4, 2024
Sunday, February 4, 2024
拉深变形在没有压板的条件下,板料进入凹模前受()。在有压板的条件下,板料进入凹模前受()。A、两向拉应力,一向压应力B、一向拉应力,一向压应力C、两向压应力,一向拉应力D、三向压应力...
Saturday, September 2, 2023
Sunday, September 11, 2022
Tuesday, July 25, 2023
Sunday, December 24, 2023
Sunday, February 4, 2024
Wednesday, October 12, 2022
用某成分铁水浇注的铸件为铁素体灰口铸铁件。如果对该成分铁水进行孕育处理,可以获得珠光体灰口铸铁,从而提高铸件的强度和硬度。...
Sunday, December 24, 2023
Saturday, February 17, 2024
Sunday, September 11, 2022
Thursday, November 16, 2023
只有经过塑性变形的钢才会发生回复和再结晶。没有经过塑性变形的钢,即使把它加热到回复或再结晶温度以上也不会产生回复或再结晶。...
Wednesday, November 15, 2023
Sunday, December 24, 2023
Saturday, September 2, 2023