Thursday, June 22, 2023
问题:调质钢中常用的合金元素有哪些,这些合金元素在调质钢中起什么作用?...
Tuesday, November 1, 2022
问题:凡使C曲线()的元素都提高过冷奥氏体的稳定性。A、右移B、左移C、不改变D、改变...
Thursday, October 12, 2023
Saturday, September 10, 2022
问题:3CrZW8V热作模具钢,在淬火回火前为减小变形和开裂倾向,要进...
Thursday, September 15, 2022
问题:低温回火温度不超过()℃,中温回火温度为300~500℃,高温回...
Saturday, September 10, 2022
问题:含Ni、Cr等合金元素的淬火钢在回火过程中可能产生回火脆性现象,...
Thursday, September 15, 2022
Saturday, September 10, 2022
Thursday, September 15, 2022
Tuesday, September 13, 2022
问题:工业上常用()的金属作高电阻材料,如电热元件或电热工件。...
Saturday, September 10, 2022
Thursday, September 15, 2022
Saturday, September 10, 2022
问题:()检验是把材料的试样经过酸(或碱)蚀后,用肉眼或低倍放大镜对其...
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Saturday, September 10, 2022
问题:在钢的火花鉴别法中,碳钢、铬钢和高速钢的火束流线各有什么特点?...
Saturday, September 10, 2022
Saturday, September 10, 2022
问题:刃位错的柏氏矢量和()位错线,螺位错的柏氏矢量和()位错线...
Saturday, September 10, 2022
问题:奥氏体中随含碳量的(),晶粒尺寸增大,至碳含量为()时随含碳量的增加,晶粒长大速度()。...
Thursday, January 19, 2023