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Engineering · Mechanical Engineering
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Soalan2 Question 2 800 1400 700 1200 600 1000 500 800 400 Critical 300 cooling rate 400 100 10 1 10 02 03 0 105 Time (s)

1400 Eutectoid temperature 700 1200 600 1000 500 400 600 100 10 102 0 105 Rajah S2 untuk soalan 2 Figure Q2 for question 2 Sila rujuk gambarajah di dalam Rajah S2 bagi keluli yang mengandungi 0.76w1% C untuk menjawab soalan-soalan di bawah. Please refer to the diagram in Figure Q2 for steel that contain 0.76 wt% C to answer the questions below a) Sila tentukan struktur mikro / mikrojuzuk terakhir yang terhasil pada keluli ini yang telah menjalani rawatan suhu-masa berikut. Dalam setiap kes dianggap bahawa rawatan bermula pada 850°C dan keluli ini telah dibiarkan pada suhu ini cukup lama untuk mencapai struktur austenit homogen. Please determine the final microstructure/ s present of this steel that has been subjected to the following time-temperature treatments. In each case assume that the treatment begins at 850°C and this steel has been held at this temperature long enough to achieve a homogenous austenitic structure.

Sila rujuk gambarajah di dalam Rajah S2 bagi keluli yang mengandungi 0.76w1% C untuk menjawab soalan-soalan di bawah Please refer to the diagram in Figure Q2 for steel that contain 076wt% C to answer the questions below a) Sila tentukan struktur mikro /mikrojuzuk terakhir yang terhasil pada keluli ini yang telah menjalani rawatan suhu-masa berikut. Dalam setiap kes dianggap bahawa rawatan bermula pada 850°C dan keluli ini telah dibiarkan pada suhu ini cukup lama untuk mencapai struktur austenit homogen Please determine the final microstructure /microconstituents present of this steel that has been subjected to the following time-temperature treatments. In each case assume that the treatment begins at 850 C and this steel has been held at this temperature long enough to achieve a homogenous austenitic structure KIG 2005 (0) Disejukkan dengan pantas ke suhu 250°C, dibiarkan selama 103 s, kemudian pelindapkejutan ke suhu bilik Rapidly cool to 250°C, hold for 10 s, then quench to room temperature. (2 markah/marks) (ii) Pendinginan berterusan ke suhu bilik dengan kadar pendinginan sebanyak 160° C/s. Continuously cool to room temperature at cooling rate of 160C/s (1 markah/marks) (ii) Disejukkan dengan pantas ke suhu 650C dan dibiarkan selama 20 saat, kemudian disejukkan dengan pantas ke suhu 400C dan dibiarkan selama Rapidly cool to 650C and hold for 20 seconds, then rapidly cool to 400C and (2 markah/marks) Pendinginan berterusan ke suhu bilik dengan kadar pendinginan sebanyak 10 saat, akhir sekali pelindapkejutan ke suhu bilik hold for 10 seconds, finally quench to room temperature. (iv) 20 C/s. Continuously cool to room temperature at cooling rate of 20C/s (1 markah/marks) (v) Sila susun kedudukan keluli selepas rawatan suhu-masa dalam soalan 20) Please rank the steel after time-temperature treatments in question 2(0 until 2(iv) (4 markah/marks) b) Sila tunjukkan prosedur rawatan haba paling mudah dalam rajah suhu melawan hingga 2(iv) mengikut kekuatan dan kemulurannya. according to their strength and ductility masa untuk menukar pearlite ke spheroidite. Bandingkan kekuatan dan Please show the simplest heat treatment procedure in temperature vs. time diagram to (5 markah/marks) kemuluran kedua-dua jenis fasa. convert pearlite to spheroidite. Compare strength and ductility of both phases


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