[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f2zh2J3PzYLZItBRrX2Cm9VU2HmihIhwqRFyLyBprBSU":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2024-04-27 09:43:34",140517413,[8,9,10,11],"含碳量","合金元素含量","加热温度","冷却速度",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},5,"eee5848c1467c7f82d4adac7b0e6bba2","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F2beec05d9e00020bad3db2ef57ef7f21.png","工程材料（2024春）","work_34509457","第4章作业","钢的淬硬性主要取决于( )",[21,32,41,49,58],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],140517409,[25,26,27,28],"(12)、(4)、(13)、(6)、(2)、(3)、(9)、(8)、(7)、(11)","(13)、(12)、(4)、(6)、(2)、(3)、(9)、(8)、(7)、(11)","(9)、(8)、(7)、(11)、(13)、(12)、(4)、(6)、(2)、(3)","(9)、(8)、(7)、(11)、(4)、(6)、(2)、(3)、(13)、(12)","1.现有下列钢号: ⑴Q235; ⑵W18Cr4V; ⑶5CrNiMo; ⑷60Si2Mn; ⑸ZGMn13; ⑹16Mn; ⑺40Cr13; ⑻20CrMnTi; ⑼9SiCr; ⑽12Cr1MoV; ⑾T7; ⑿40Cr; ⒀GCr15; ⒁Cr12MoV (1)制造机床齿轮应选用 ________________; (2)制造汽车板簧应选用 ________________; (3)制造滚动轴承应选用 ________________; (4)建造南京长江大桥桥梁应选用 ________________; (5)制造高速车刀应选用 ________________; (6)制造热锻模应选用 ________________; (7)制造丝锥应选用 ________________; (8)制造汽车变速箱齿轮应选用________________; (9)制造医用手术刀应选用________________; (10)制造木工凿子应选用________________","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],140517410,[36,37,38,39],"20Cr渗碳、淬火+低温回火","W18Cr4V淬火+低温回火","GCr15淬火+低温回火","ZGMn13水韧处理","拖拉机和坦克履带板受到严重的磨损及强烈冲击,应选用( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":48,"source":30,"type":31},[],140517411,[45,46,47],"正火;正火;退火","正火;球化退火;退火","球化退火;正火;正火","为改善钢的切削加工性能,请指出下列钢件的预备热处理方法及组织:(1)20Cr钢;(2)T12钢;(3)45钢",{"answer":50,"createTime":5,"id":51,"options":52,"question":57,"source":30,"type":31},[],140517412,[53,54,55,56],"完全退火","球化退火","锻造加工","正火","为了改善高速钢铸态组织中的碳化物不均匀性,应进行 ______",{"answer":59,"createTime":5,"id":6,"options":60,"question":19,"source":30,"type":31},[],[8,9,10,11]]