问题:试样经拉伸试验后性能合格,但试样上显示出肉眼可见的冶金缺陷,例如...
Sunday, September 11, 2022
Monday, September 12, 2022
问题:38CrMoAl由于含铝高,钢液稠,容易出现点状偏析。...
Monday, September 12, 2022
Sunday, September 11, 2022
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:计算断面收缩时,矩形截面试样颈缩处最小横截面积S1的测量方法为;...
Monday, September 12, 2022
Tuesday, February 6, 2024
Monday, September 12, 2022
Sunday, September 11, 2022
问题:黑色金属进行维氏硬度试验时,试验力保持时间一般为()。A、10秒以下B、30±2秒...
Sunday, January 28, 2024
问题:疲劳裂纹扩展槛值是已存在疲劳裂纹不发生扩展的()值。...
Sunday, September 11, 2022
问题:落锤试样的缺口可以采用专用压刀压制出或是其他机械加工方法。...
Sunday, September 11, 2022
Sunday, September 11, 2022
Tuesday, February 6, 2024
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:对钢样做布氏硬度试验时,试验力保持时间应为()。...
Sunday, September 11, 2022
问题:采用静载荷压入法的硬度试验方法是()。A、布氏硬度、维氏硬度、洛氏硬度B、肖氏硬度、锤击式布氏硬度C、布氏硬度、维氏硬度、洛氏硬度、肖氏硬度、锤击式布氏硬度...
Saturday, July 22, 2023
Sunday, September 11, 2022